Ex3: Put the verbs in the present perfect tense. 1. My sister (be).................................a teacher for ten years. 2. I (not see)..............................Linh since my birthday. 3. We (wait)....................................for a year. 4. They (build)..............................that house since last years. 5. Lan (know).....................................him since she was a child. 6. You (take)...............................the medicine yet ? 7. How long you (live)..................................here ? 8. He (not send)................................any letters to me since 2003. 9. Mrs. Dung (already / make)................................a new shirt for her son. 10. My mother (just /buy).................................me a new bicycle. 11. He (practice).................................the piano since 8 o'clock. 12. I (not meet) him.....................................this movie since last week 13. Jorge (read).................................the newspaper for an hour. 14. ...............Maria (learn)...........................English since grade 6 ? 15. He (swim)..............................for half an hour. 16. How long Mr. Johnson (work)................................here ? For 35 years. 17. We (begin)...............................to study for the test since this morning. Mấy bn giúp tui với tui đang cần rất gấp cảm ơn mn nhìu ạ