Here are the sentences with the verbs in brackets put into the correct tense:

1. I (not see) **have not seen** your brother recently.
2. They (not contact) **have not contacted** each other for a long time.
3. How long **have** you (study) **studied** English?
4. How many times **have** you (see) **seen** him since he went to Edinburgh?
5. Who is that woman? I (never see) **have never seen** her before.
6. We (be) **have been** from French. We (be) **have been** there for 20 years.
7. I (see) **have seen** that film several times because I like it.
8. Mary (lose) **has lost** her hat for 2 days.
9. He (not finish) **has not finished** doing it yet.
10. He (not see) **has not seen** him since Christmas.