English version

keep at something

From Longman Dictionary of Contemporary Englishkeep at something phrasal verb1 keep at it spokenCONTINUE/NOT STOP to continue to do something, although it is difficult or hard work I know it’s hard, but keep at it! Don’t give up!2 keep somebody at somethingWORK HARD to force someone to continue to work hard and not let them stop keep→ See Verb table
Examples from the Corpus
keep at The animals were kept at 20°C, 50% humidity and a light/dark cycle of 12/12 hours.The population were kept at a pre-technological level of civilization, with android advisers to make their lives easy.Velvet can be kept at bay by good husbandry.As a criticism of the modern world, Fantasia of the Unconscious is a book to keep at hand and re-read.In those optimistic times, the commission thought that if they just kept at it they could eventually eradicate the gypsy moth.Getting a novel published has inspired White to keep at it.Hence Phoenix always keeps at least two of its garbage districts in public hands-so it will always have the capacity to compete.We kept at them and finally wore them down.
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Verb table
keep
Simple Form
Present
I, you, we, theykeep
he, she, itkeeps
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Past
I, you, he, she, it, we, theykept
Present perfect
I, you, we, theyhave kept
he, she, ithas kept
Past perfect
I, you, he, she, it, we, theyhad kept
Future
I, you, he, she, it, we, theywill keep
Future perfect
I, you, he, she, it, we, theywill have kept
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Continuous Form
Present
Iam keeping
he, she, itis keeping
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you, we, theyare keeping
Past
I, he, she, itwas keeping
you, we, theywere keeping
Present perfect
I, you, we, theyhave been keeping
he, she, ithas been keeping
Past perfect
I, you, he, she, it, we, theyhad been keeping
Future
I, you, he, she, it, we, theywill be keeping
Future perfect
I, you, he, she, it, we, theywill have been keeping
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