16
2) has been washing
3) use
4) is
5) have been living
6) have never seen
7) have washed
8) make
9) are always making
10) are always drinking
11) are you going
12) am seeing
18
2) it's the funniest story she has ever heard.
3) she has never read Tolstoy before.
4) she has never had such a bad headache.
5) it's the first time he has ever played cricket.