II. Put the verbs in brackets into the present perfect tense.
1. Tom (see) _________________ this film before.
2. I (finish) ________________________ my exercise already.
3. They (live) __________________ here since 1990.
4. Mary (never/ be) _____________________ to Hanoi.
5. The students (discuss) ___________ the question recently.
6. Your mother (ever/wash) _________________ her car?