5. l (meet) met robert at the supermarket this morning.
6. nancy (be) has been to viet nam several times.
7. l (not see) haven't seen your brother yet.
8. when (your father/ give up) did your father give up smoking?
9. my pen isn't here any more. someone (take) has taken it already.
10. the motorbike looks clean. ( you/ wash) Have you washed it?