Ответ:
1.
I have already done my homework.
She has just washed up.
We have written a dictation.
2.
I have been doing my homework since morning.
She has been washing up since 2 o'clock.
We have been writing a dictation since 40 minutes.
Объяснение:
Present perfect:have/has+v3
Present perfect continuous:have/has+been+v4(continuous form)