1) seen
2) ever eaten
3) has/has
4) have flown
5) has never
6) have/haven't
7) haven't
8) have/have
9) have been to
10) haven't cleaned
11) have
12) has/has
13) has driven
14) done/have
15) now
16) yet
1) seen
2) ever eaten
3) has/has
4) have flown
5) has never
6) have/haven't
7) haven't
8) have/have
9) have been to
10) haven't cleaned
11) have
12) has/has
13) has driven
14) done/have
15) now
16) yet