сделайте предложение отрицательными а потом вопросительными: I have finished my work,
They have seen this film, Mr Brown has learnt many new words

I haven t  finished my work. Do you finish work?

1) I haven't finished my work.Have I finished my work?
2)They haven't seen this film.Have they seen this film?
3)Mr Brown hasn't learnt many new words.
Has Mr Brown learnt any new words?