giải va giải thích vì sao hộ em với 1. When I (A) was a child, I (B) was riding (C) a tricycle (D) to school. 2. I can’t (A) come out (B) because I (C) didn’t finish my homework (D) yet. 3. (A) We’d better (B) wait here (C) until the rain (D) will stop. 4. (A) When the film (B) started, I (C) already arrived ten minutes (D) before. 5. (A) As a scientist, (B) my father doesn’t come home (C) until very late (D) at the night.

`1.` B `->` rode

- Thì QKD

- DHNB: MĐQK(When + QKD)

`2.` C `->` haven't finished

- Thì HTHT

- DHNB: yet

`3.` D `->` stops

- Sau until dùng thì HTD để diễn tả một hành động ở TL. 

`4.` already arrived `->` have already arrived

- Thì HTHT

- DHNB: already

`5.` D `->`  at night

- at night là cấu trúc cố định

`1.` B

`\text{Sửa: rode.}`

`\text{QKĐ}`

nhận bt: When I  was a child

S + Ved/VPI + (O).

`2.` C

`\text{Sửa: haven't finished}`

`\text{HTHT}`

nhận bt: yet

S + hasn't/haven't + VPII + (O).

`3.` D

`\text{Sửa: stops}`

`\text{HTĐ}`

nhận bt: until 

S + V(s/es) + (O).

`4.` C

`\text{Sửa: have already arrived}`

`\text{HTHT}`

nhận bt: already

S + has/have+ already + VPII + (O).

`5.` D

`\text{Sửa: at night}`

`\text{at night: vào buổi tối}`