1. If I were you, I would take the train instead of the bus.

`->` If 2: If + S1 + V2/ed, S2 + would + Vinf

2. Someone must have forgotten to lock the door.

`->` must have Vpp: chắc hẳn

3. They have had this house for 10 years.

`->` S + have/has + Vpp + for + khoảng thời gian

4. At the end of the course, there was a big party.

`->` Cuối khóa học, sẽ có một buổi tiệc lớn.

5, The pop star whom we invited onto the chatshow didn't turn up.

`->` whom thay cho túc từ chỉ người

6. How long is it since you started the project ?

`->` How long is it + since + S + V2/ed

1. If i were you, i would take the train instead of the bus.

2. Someone must have forgotten to lock the door.

3. They have had this house for ten years.

4. At the end of the course, there was a big party.

5. The pop star whom we invited onto the chat show didn't turn up.

6.How long have you started the project ?