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Đáp án+Giải thích các bước giải:

I'm leaving now because I don't want to miss the train.
→ (so) I'm leaving now so that I don't miss the train.
Dùng "so that" để nói lý do làm gì đó.

The last time I saw my uncle was two years ago.
→ (for) I haven't seen my uncle for two years.
Chuyển từ quá khứ đơn sang hiện tại hoàn thành với "for + khoảng thời gian".

Let me reach my office and then I will talk to him.
→ (when) When I reach my office, I will talk to him.
Dùng "when" để nối hai hành động liên tiếp trong tương lai.

Why don’t we donate our old books, toys and clothes to charity?
→ (suggests) Mom suggests donating our old books, toys and clothes to charity.
Cấu trúc "suggest + V-ing".

Jane stayed behind after the class in order to talk to the teacher.
→ (because) Jane stayed behind after the class because she wanted to talk to the teacher.
"in order to" → chuyển sang "because + S + V".

This is the first time they’ve been to Korea.
→ (before) They’ve never been to Korea before.
"This is the first time" = "They have never... before".

How long have you been a member of Volunteers in Asia?
→ (join) When did you join Volunteers in Asia?Câu hiện tại hoàn thành → quá khứ đơn với "when".

We suggested people recycle glass, cans and paper.
→ (encouraged) We encouraged people to recycle glass, cans and paper.
"encourage + someone + to V".