1) She remembers part of her childhood quite clearly. For instance, she remembers (go) to school for the first time.

going
would go
goes
was going

2) It was true that we (know) each other for five and twenty years.

were knowing
have known
knew
had known

3) He (appear) really angry. What’s up?

Appears
appeared
is appearing
had appeared

4) We (take) mother to the doctor the other day. She had been complaining of pain in her back.

have taken
took
had taken
take

5) The last bus (leave) in ten minutes, so I have to say good-bye now.

will leave
has left
leaving
leaves