11) 2 didn't go
3 did you see
4 wrote
5 when did you hear
6 met
7 didn't tell
8 had
9 when did you do
10 went
12) 2 what were you doing
3 wasn't work
4 were playing
5 why were they wearing
6 wasn't using
13) 2 have shown
3 have done
4 have climbed
5 have explored
6 have seen
7 has taken
8 haven't been