Past Tense of Keep: Kept — and Why Sleep, Sweep Shorten the Same Way

You listen to an interview clip, the speaker talking about a stretch of time waiting for a job, and you transcribe it as "She keep going for another month". The transcript reads "She kept going for another month". You rewind three times and still hear two identical-sounding sentences, because the only thing you're missing is a vowel that's just slightly shorter. Quick answer first: the simple past of keep is kept, and the past participle is also kept. There is no form "keeped".

keep has two hard spots, at two different levels. The sound level: kept ends in the consonant cluster /pt/, and in real speech that /t/ disappears almost entirely when the next word starts with a consonant, so the entire signal of "past" gets pushed onto the vowel, where the long /iː/ shrinks down to a short /e/. The meaning level: Vietnamese lumps keep, hold, save, store into one word, giữ, while English forces you to pick exactly one of the four.

This article goes through the whole chain: the form table for keep, the group of verbs that shorten their vowel and add a t, of which keep is a typical member, where kept sits in a sentence, how keep differs from hold and save, common phrases, and — the most important part for listening practice — how the final /pt/ cluster of kept actually sounds at normal speaking speed.

• The form table for keep, and the vowel-shortening-plus-t group
• Where kept sits in a sentence, and how keep differs from hold and save
• Hearing kept in real speech
• Thirteen phrases with keep you meet every day
• Mistakes Vietnamese speakers commonly make with keep
• Quick exercise
• Frequently asked questions

The form table for keep, and the vowel-shortening-plus-t group

Five forms, neatly in one table. The pronunciation column is in the American accent, with British differences noted where they occur.

Form	Word	Pronunciation	Short example
Base form (V1)	keep	/kiːp/	I keep a spare key here.
Third person singular	keeps	/kiːps/	She keeps her notes online.
Simple past (V2)	kept	/kept/	I kept the receipt.
Past participle (V3)	kept	/kept/	We have kept in touch.
Present participle	keeping	/ˈkiːpɪŋ/	He is keeping the door open.

The most notable point in this table sits in rows three and four. The vowel doesn't change in some random way — it shrinks: the long /iː/ in keep drops down to a short /e/ in kept, the exact same vowel as in the word bed. Then, instead of getting an -ed ending, the word gets a /t/ sound tacked directly onto the /p/.

keep isn't alone in this. A whole group of verbs does exactly the same thing: sleep becomes slept, sweep becomes swept, creep becomes crept, weep becomes wept, feel becomes felt, deal becomes dealt, mean becomes meant, kneel becomes knelt, leave becomes left, lose becomes lost. Looking at the whole group, the formula becomes very clear: the long vowel shortens, and the ending is a single /t/ sound, not a new syllable.

This detail isn't irregular in the way go/went is irregular. Historically, these were originally regular verbs, taking exactly the same dental ending that every regular verb takes. What happened afterward is that the original vowel got shortened when it stood in front of two consonants together, and the /d/ ending became voiceless, turning into /t/, because the /p/ right before it is also voiceless. The result is a form that looks irregular but is actually the outcome of two very consistent phonetic rules.

The practical payoff of knowing this: you don't have to learn kept as a one-off case. You learn one pattern, then apply it to a dozen other verbs in the same group, and you also understand why their ending is always /t/ and never /ɪd/.

A few verbs from the same group are worth reading right alongside this one. The past tense of sleep is the closest match to keep — slept shortens its vowel the exact same way and also uses one shared form for V2 and V3. The past tense of sweep follows the same pattern but has an added /sw/ cluster at the front that makes the whole word harder to catch by ear. The past tense of feel also shortens its vowel, but the final consonant is /l/, so felt sounds quite different from kept even though the mechanism is the same. If you want to slot the whole system in place and put verbs in their correct spot, the English grammar article does that.

Where kept sits in a sentence, and how keep differs from hold and save

kept stands alone as the main verb of a simple-past sentence, and it also follows have, has, had to serve as the participle, because keep's V2 and V3 are one and the same. You don't have to choose between two different spellings the way you do with hide or take — you only have to pick the tense, and remember that after did the verb goes back to the base form keep.

Sentence	Correct or incorrect	Why
I kept the receipt in my wallet.	Correct	Simple past, kept stands alone as the main verb
We have kept in touch since school.	Correct	kept follows have, functioning as the participle
We have keep in touch since school.	Incorrect	After have you need the participle kept
Did you kept the old files?	Incorrect	After did you need the base form keep
She kept telling me the same thing.	Correct	keep takes V-ing, not to V
She kept to tell me the same thing.	Incorrect	keep is not followed by to V

The part that actually causes trouble with keep isn't verb conjugation, since kept has only one form. It's the fact that Vietnamese has one word, giữ, used for far too many situations, while English splits it into four verbs pointing in four different directions. The table below lines up those four words side by side in the past tense.

Sentence	Real meaning
I kept the receipt.	I held onto the receipt, didn't throw it away, it's belonged to me ever since
I held the receipt.	I had the receipt in my hand, a matter of one moment
I saved the receipt.	I set the receipt aside to use later, usually saved somewhere
I stored the receipt.	I put the receipt away in some storage place, emphasizing the location
She kept me waiting.	She made me wait, keep causing a state to continue
She kept me from sleeping.	She kept me from being able to sleep, keep somebody from V-ing means to prevent

The first four rows show the dividing line: keep is about continuing to possess something or continuing in a state, hold is about grasping something for one moment, save is about setting something aside for the future, store is about the place something is kept. When you're about to write giữ in English, the question to answer is whether you're talking about possession, about a hand, about the future, or about a storage place.

The last two rows are a separate structure worth memorizing as whole chunks. keep somebody doing something means to keep someone continuing in a state. keep somebody from doing something means to prevent someone from doing something. They differ by just the word from, yet the meaning flips completely, and this is exactly where learners most often slip up in writing.

So when do you choose kept instead of have kept? Same general rule of tense as always. If there's a closed time marker, use the simple past: "I kept it for three years, then threw it out". If you're talking about something that still carries through to now, use the perfect: "I have kept it for three years", meaning it's still there now.

Hearing kept in real speech

This is the part you won't find in any conjugation table, and it's also the part that decides whether you transcribe kept correctly or not. On paper, kept and keep are clearly different. In audio, the part that differs is exactly the part that tends to get erased — the very part you're listening for.

The final /pt/ cluster in kept is almost never fully articulated as two separate sounds. The lips close for /p/, then the tongue has to touch the ridge behind the teeth for /t/, and in fast speech native speakers drop the release of the /p/ entirely. What you hear is an extremely short pause followed by the next sound.

Before a consonant, the /t/ dissolves completely. "kept going" comes out as "kep-going", "kept quiet" comes out as "kep-quiet", "kept moving" comes out as "kep-moving". At that point the only difference between keep going and kept going is the length of the vowel — meaning the entire signal of tense lives inside a single vowel.

Before a vowel, the /t/ links over into the next word and becomes a single tongue-tap. "kept it" comes out as "kep-tit", sometimes contracted so far it sounds like "keppit". "kept up" comes out as "kep-tup". "kept an eye on it" comes out as one fused block, "kep-tan-eye-on-it".

Before a nasal consonant, /t/ gets swallowed and the whole word sounds clipped. "kept me waiting" comes out as "kep-mi weiting". "kept them out" comes out as "kep-thəm-out", sometimes just "kep-'em out". The learner is waiting to hear a clear /t/ sound, and there's nothing there to catch.

have and has before kept shrink into a single consonant sound. "I have kept it" in real speech is "I've kept it", and the 've part is just a /v/ sound stuck onto the subject. Missing that part means writing down "I kept it" — a grammatically correct sentence, but the wrong tense compared to the original.

At the end of a sentence, kept comes through very clearly. "That is the only one I kept" has the /t/ popping out fully because there's no word after it to swallow it. This is why you can hear kept in this sentence but miss it in the middle of another one — and it's not because your ear is inconsistent.

The table below lines up three things side by side: the original sentence, the sound that comes out when a native speaker talks at normal speed, and the way learners often mis-transcribe it. The middle column writes down the real-world sound of the sentence, not a standard phonetic transcription.

Real sentence	Sounds like	Learners often write it as
She kept going for another month.	shi kep-going fər ənathər manth	She keep going for another month.
He kept it in his back pocket.	hi kep-tit in iz bæk pokit	He keep it in his back pocket.
They kept me waiting for an hour.	they kep-mi weiting fər ən aur	They keep me waiting for an hour.
We've kept in touch since 2018.	wiv kep-tin tach sins...	We kept in touch since 2018.
She kept quiet about the whole thing.	shi kep-kwaiət əbaut...	She keeps quiet about the whole thing.
That is the only file I kept.	thæts thi ounli fail ai kept	That is the only file I keep.

The third column breaks down into three types of error. Lines one, two, three and five are vowel errors: the /t/ sound has been deleted, so the ear is left with only /iː/ versus /e/ to tell them apart, and present tense is the default form sitting in the learner's head, so it wins out. Line four is a function-word error — the unstressed 've part gets skipped, and the sentence drops from present perfect down to simple past. Line six is the opposite case: the /t/ sound comes through very clearly because it's at the end of the sentence, but the learner still writes present tense because nothing else in the sentence signals a time marker.

During dictation practice on WELE, you'll see this pattern repeat sentence after sentence. You listen to a sentence, write down exactly what you hear, and then the grading feature points straight at the word that's off. When the word marked wrong is kept and you wrote keep, the feedback you get is much narrower than a reminder to review verb conjugation tables: your ear skipped over vowel length, and for the whole group of sleep, sweep, creep, feel, vowel length is exactly where the tense lives.

Fix it once with keep and the whole group benefits, because they all run on the same mechanism. After reading the table at the start of this article, ten minutes later you'll still remember that the past tense of keep is kept, but your ear hasn't changed at all. If you want to understand why the /t/ sound dissolves in the first place rather than assuming your listening is just weak, the article on connected speech explains the mechanics of sound-swallowing and linking across a whole sentence. The podcast library is where you can try it right away — every episode has a transcript so you can check back against every sentence you wrote down.

Thirteen phrases with keep you run into every day

keep is a verb that spawns a huge number of phrases, and in real conversation you run into these phrases far more often than you run into keep standing alone. The thirteen lines below are written in the past tense so you get used to seeing kept right away.

Phrase	Meaning	Example
keep up	Maintain, keep the pace	She kept up the same routine all winter.
keep up with	Keep pace with someone or something	I could not keep up with the reading last term.
keep on	Keep going, often with a sense of persistence	He kept on asking until I answered.
keep off	Stay away from, avoid touching	She kept off sugar for two months.
keep out	Not let in	The fence kept the dogs out.
keep away from	Stay away from	We kept away from that part of town.
keep back	Hold back, not give all of it	He kept back the worst of the news.
keep down	Keep low, hold back	They kept costs down all quarter.
keep to	Stick closely to, follow	We kept to the original plan.
keep at it	Keep persisting	She kept at it until the code compiled.
keep in touch	Stay in contact	We kept in touch by email for years.
keep an eye on	Watch over	I kept an eye on the clock the whole time.
keep track of	Monitor, not lose track of	He kept track of every expense.

There's one detail worth noticing in the keep up line. The same phrase, with a different tense, feels completely different. "She kept up the routine all winter" recounts a winter that has already passed, and says nothing about the present. "She has kept up the routine all winter" says that up to this point she is still maintaining it. The distinguishing marker is exactly the contracted has out front — that is, precisely the part that's easiest to lose when listening.

One more detail about structure. keep on and keep at it both carry the meaning of continuing, but keep on usually has a persistent, almost annoying shade to it, while keep at it carries a sense of perseverance and is usually a compliment. "He kept on asking" sounds like he asked to the point of being irritating. "He kept at it" sounds like he was persistent.

Mistakes Vietnamese speakers commonly make with keep

keeped. The reflex of adding -ed to every verb. keep never conjugates by the rule, and kept doesn't need anything added to it either. There's only kept — no keeped, no kepted.

Pronouncing kept as /kiːpt/. This is a pronunciation error that leads straight into a listening error. If in your head kept still keeps the long vowel of keep, then when a native speaker says /kept/ with the short vowel, your ear has no matching pattern for it. The vowel in kept is exactly the same as the vowel in bed, and the same as kept in slept, swept.

Did you kept. Did already carries the past-tense meaning, so the verb that follows it goes back to the base form. The correct sentence is "Did you keep the old files?". This mistake tends to show up right when you're remembering very carefully that the past tense of keep is kept.

keep + to V. After keep comes V-ing, not to V. "He kept telling me" is correct, "He kept to tell me" is wrong. Note that keep to is a completely different phrase, meaning to stick closely to: "We kept to the plan". These two look nearly identical in writing, so they're very easy to mix up.

keep somebody to do something. The structure for preventing something is keep somebody from doing something. "The noise kept me from sleeping" is correct. "The noise kept me to sleep" doesn't mean anything in English. And if you drop from altogether, the meaning flips: "The noise kept me sleeping" ends up meaning the noise helped you keep sleeping.

Using keep for every sense of "giữ." "Please keep the door" is a sentence Vietnamese speakers often write when they mean hold the door for me, and a native speaker won't understand it. The sentence you need is "Please hold the door". Conversely, "I held the receipt for three years" sounds like you held it in your hand for three whole years — the correct sentence is "I kept the receipt for three years".

Quick exercise

Eight sentences — fill in keep, keeps, kept, or keeping. Scroll down to the answers after you've filled in all of them.

1. She ______ going even after the others stopped.
2. We have ______ in touch since we graduated.
3. Did you ______ the old contract?
4. The noise ______ me from sleeping last night.
5. He ______ on asking until someone answered him.
6. That is the only photo I ______ from that trip.
7. They are ______ the costs down this quarter.
8. My brother ______ a spare key in his car, he still does.

Answers: 1. kept. 2. kept. 3. keep. 4. kept. 5. kept. 6. kept. 7. keeping. 8. keeps.

Sentences 3 and 8 are the two worth pausing on. Sentence 3 has did in front of it, so the verb goes back to the base form, and a lot of people fill in kept because they're focused on remembering the past-tense form. Sentence 8 has the clause "he still does" at the end pulling the whole sentence back into the present, so the answer is keeps, not kept, even though at a glance the sentence looks like it's telling an old story. If you missed these two, the right/wrong table above is worth reading through one more time.

Frequently asked questions

What is the past tense of keep?

The past simple and past participle of keep are both kept, pronounced /kept/ with a short vowel like the word bed. There is no form keeped in English.

Why does keep become kept and not keeped?

keep belongs to a group of verbs that originally conjugated regularly, but the vowel gets shortened when it stands before two consecutive consonants, and the /d/ ending becomes devoiced into /t/ because the /p/ before it is voiceless. In the same group there are also sleep, sweep, creep, weep, feel, deal, mean.

After keep, do you use V-ing or to V?

Use V-ing. "He kept talking", "She kept walking". The structure keep to is a different matter — it means sticking closely to a plan or a path, and after to comes a noun, not a bare infinitive.

How is keep different from hold?

keep talks about continuing to possess something or continuing a state, usually over a stretch of time. hold talks about grasping something or keeping it in place for a moment. "I kept the ticket" means I still have the ticket, "I held the ticket" means I'm holding it in my hand right now.

What does keep somebody from doing something mean?

It means to prevent someone from doing something. "The rain kept us from leaving" means the rain stopped us from leaving. Drop the word from and the meaning flips to letting someone go on doing that thing, so the word from here is not a small detail.

Why does kept get written down as keep when you hear it?

Because the final /t/ sound disappears when the next word starts with a consonant, and at that point the only clue left is the vowel length. The fix isn't to relearn the rule but to listen again to the keep and kept pair many times until your ear can tell /iː/ apart from /e/. A benchmark before you start practicing is the listening level test, and a few weeks later you use it again.

You can read through the table of keep's forms in thirty seconds, and that's the easiest part of this page. The rest — the way the /pt/ cluster disappears in the middle of a sentence, and the way an entire tense gets packed into one short vowel — only really sinks in once you mishear it and then see where you wrote it down wrong. Pick a short conversation that has kept in it and try dictation listening practice once, then go back to the table at the top of the article and see if it still looks dry to you.