1.It's 3 months since the last time my sister came back home.
- Giải thích : It's + time + since the last time + S + V (QKĐ).
= S + haven't/hasn't +VII + for +time.
2.If you are careful, you won't drop these plates.
- Giải thích : CĐK loại 1 : If + S +V (HTĐ), S + V (TLĐ).
3.Lan told Minh that she would go with him on his trip to Ha Long the next week.
- Giải thích : will ⇒ would; next / on ... ⇒ the next / following ...
4.Some young trees haven't been watered in the back garden by my father for a few days.
- Giải thích : Câu bị động của thì HTHT : S + haven't/hasn't +been + VII + by O .
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