1/ doesn't drink ( HTĐ ; dấu hiệu : often )
2/ bought ( QKĐ ; dấu hiệu : two months ago )
3/ is helping ( HTTD ; dấu hiệu : at this time )
4/ was ( QKĐ ; dấu hiệu : last night ) - miss
5/ to send ( sau need + to V1 )
6/ talking ( sau like + V-ing )
7/ phoned ( QKĐ ; dấu hiệu : last week ) - didn't see
8/ will come ( TLĐ ; dấu hiệu : next Sunday )
1/ was ( QKĐ ; dấu hiệu : yesterday )
2/ got ( QKĐ ; dấu hiệu : yesterday )
3/ did ( QKĐ ; dấu hiệu : yesterday )
4/ took ( QKĐ ; dấu hiệu : yesterday )
5/ combed ( QKĐ ; dấu hiệu : yesterday )
6/ had ( QKĐ ; dấu hiệu : yesterday )
7/ ate ( QKĐ ; dấu hiệu : yesterday )
8/ drank ( QKĐ ; dấu hiệu : yesterday )
9/ helped ( QKĐ ; dấu hiệu : yesterday )
10/ brushed ( QKĐ ; dấu hiệu : yesterday )
11/ put ( QKĐ ; dấu hiệu : yesterday )
12/ went ( QKĐ ; dấu hiệu : yesterday )
13/ had ( QKĐ ; dấu hiệu : yesterday )
14/ returned ( QKĐ ; dấu hiệu : yesterday )
15/ did ( QKĐ ; dấu hiệu : yesterday )
16/ ate ( QKĐ ; dấu hiệu : yesterday )
17/ took ( QKĐ ; dấu hiệu : yesterday )
18/ was ( QKĐ ; dấu hiệu : yesterday )
19/ came ( QKĐ ; dấu hiệu : yesterday )
20/ went ( QKĐ ; dấu hiệu : yesterday )