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Вопрос		Ответ
PS when? начать обучение		past & finished actions
PP effects начать обучение		past action which has some results now
PS operator начать обучение		did, was/were
PP operator начать обучение		have, has
PS verb form начать обучение		II verb form
PP verb form начать обучение		III verb form
PS important words начать обучение		yesterday, ... ago, last ..., in 1995, on Monday, at 3 pm
PP important words начать обучение		since/for, yet, already, just, before, recently/lately, never/ever, so far, still

past simple & present perfect