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Yesterday I didn't saw my friend at the university. I was waiting for him near the library, but he only came in the evening. He said he was busy because he готовился for the exam all day.
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Correction
didn't sawdidn't see
Why it changes
Didn’t already marks the past tense. The following verb stays in its base form, see.
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готовилсяwas preparing / was studying
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endeavour
стараться, попытка
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