1) The girl is my younger sister. She is playing in the garden.

⇒The girl who is my young sister is playing in the garden.

Giải thích: mệnh đề quan hệ, chỉ người nên dùng who

2) She left university two years ago.

⇒It is two year since she left university.

Giải thích: S+V (quá khứ)+thời gian+ago

→It is+thời gian+since +S+V (quá khứ)

3) She couldn’t join us because she was busy.

⇒She was busy, so she couldn't join us.

Giải thích: “So” là một liên từ chỉ kết quả, mang nghĩa là “vì thế, vì vậy, bởi thế, vì vậy cho nên”,đứng trước vế thứ hai trong câu ghép, trước nó sẽ có dấu phẩy 

4)“ Do your parents live near here,Ha?” asked Nam.

⇒Nam asked Ha if her parents lived near there.

Giải thích: chuyển câu hỏi dạng do về thể bị động, lùi thì, here→there

1. The girl who is playing in the garden is my younger sister.
2. It has been two years since she left university.
3. If we don't hurry up, we'll miss the train.
4. Green trees were planted around their house.
5. If John weren't too tired, he would go out.
6. I haven't heard from my sister for 5 months.
7. Mai is the best painter in the group.
8. I asked them where they were going for their holidays.

1) The girl is my younger sister. She is playing in the garden.

⇒The girl who is my young sister is playing in the garden.

Giải thích: mệnh đề quan hệ, chỉ người nên dùng who

2) She left university two years ago.

⇒It is two year since she left university.

Giải thích: S+V (quá khứ)+thời gian+ago

→It is+thời gian+since +S+V (quá khứ)
3. If you don’t hurry up,you will miss the train.
4.Green trees were planted around their house