забудьте про вспомогательный глагол):
I (read) this book.
2) They (study)
at this university.3) He (hurt) his leg.
4) She (shut) the door.
5) He (finish) his homework.
6) He (decide).
I have read this book.
They have studied at this university.
He has hurt his leg.
She has shut the door.
He has finished his homework.
He has decided.