1. has seen

2. have finished

3. have lived

4. has just washed

5. have discussed

6. has never been

7. have known

8. have learnt/ have learned

9. have been

10. have stayed

1.Tom have seen this film before

2. I have finished my exercise already

3. they have lived here since 1990

4. My father has just washed his car

5. the students have discussed the question recently

6.Mary has never been to Ha Noi

7. We have known each other for 5 years

8. So far we have learnt five lessons

9. We have been pen pals for long time

10. They have stay here since last week