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she has seen Mary today.

вопросы: General, Wh ...

Where when why who whom

or question

tag question

Has she seen Mary today?

has she seen Mary or Kate today?

She has seen Mary today, hasn't she?

Who has seen Mary today?

Who has Mary seen today?

(whom в вопросе сейчас почти никогда не ставится. вместо него who)

where has she seen Mary?

why has she seen Mary?

when did she see Mary?

(вопроса с when не бывает в present

perfect. надо в past simple)

я надеюсь, твой учитель знает эти правила