`11` My brother sometimes(stay)……stays….…..up late.

`=>` sometimes là HTĐ.

`12` We usually(be)………are usually…….……happy.

`=>` be+ usually, often, seldom,....

`13` He (leave)………has left………….Hue lately.

`=>` lately là HTHT.

`14` They wish they(visit)……visited…….…… Hue some day.

`=>` S + wish(es) + (that) + S + V-ed

`15` He (not finish)………didn't finish…….….his work last week.

`=>` last week là QKĐ.

`16` She wishes it (not rain)………wasn't raining…….………... now.

`=>` S + wish(es) + (that) + S + not + V-ed

`17` He (not meet)……hasn't met……………her for a long time.

`=>` for a long time là HTHT.

`18` We (live)….………have lived…….… there since last year.

`=>` since là HTHT.

`19` Last night she (watch)……watched……..……………TV late.

`=>` Last night là QKĐ.

`20` Be careful! The teacher (look)………is looking…….…….at you.

`=>` Be careful! là HTTD.

11, stays (vì brother là số ít)
12, are (we là số nhiều)

13, has left (He là số ít)
14, can visit (sau can động từ nguyên mẫu)

15 Hadn't finish (quá khứ)
16, isn't rainning (hiện tại tiếp diễn)
17, hasn't met ( He là số ít)

19, watched (quá khứ)
20, is looking (hiện tại tiếp diễn, teacher số ít)

#họctốt!
@Rin