1. The last time they met each other was when they were at school.

2. The assistant gave me such confusing information that I didn't know what to do.

3. The house by the river hasn't been sold yet. 

4. Were everybody come to the party early enough?

1. They haven’t met each other since they left school (was)->the last time they met each other was when they left school-the last time+S+Ved/c2..t/d quá khứ

2. The information I got from the assistant was so confusing that I didn’t know what to do (such)->the assistant gave me such confusing information that I didn’t know what to do-cấu trúc such...that

3. They haven’t sold the house by the river yet (been)->the house by the river hasn't been sold yet-câu cho trước đgt chia ở thì htht và từ cho là been nên chuyển thành câu bị động

4. Everybody came to the party early enough, didn’t they? (Were)->were everybody came to the party early enough?

mọi người đã đến bữa tiệc đủ sớm chưa?