4.does
5.did/go
6.will be
7.was
8.were
9.visited
10.Did/went
11.washes
12.were
13.listened
14.Has he had
15.took
16.chats
17.Did Liz buy
18.Did they see
19.go
20.won't eat
21.wore
22.taught
23.Did Ba and Tan remember
24.Will Nam return
25.danced/sang
26.is he going
27.got/have
28.bought
29.isn't going 
30.had