1. The old stamps were collected by John.
-> Câu bị động quá khứ đơn: S + was/were + Vpp
2. Your book isn't as thick as my book.
-> So sánh không bằng: S + be + as + not + adj + as + O
3. I wish it weren't cold today.
-> Câu mong ước nên lùi thì, câu trên khẳng định nên chuyển về phủ định
4. It is harmful to drink to much alcohol.
-> Ving + be + adj = It + be + adj + to V
5. I told him that I would pick him up the next day at gate A- Can Tho University.
-> Câu trần thuật nên lùi thì từ "will" thành "would" , chuyển "tomorrow" thành "the next day"