Dạng bị động thường có câu trúc: S+ be+ PII (be có chia)+ (by O)

1. A new house will be bought.

2. The Math problem could be solved easily.

3. Hoa was invited to his birthday party by Nam last night.

4. The problem has been explained carefully by our teacher.

5. This house is going to be bought.

1.She will buy a new house

-> A new house will be bought.

2.He could solve the math problem easily

-> The math problem could be solved easily.

3.Nam invited Hoa to his birthday party last night 

-> Hoa was invited to his birthday party by Nam last night.

4. Our teacher has explained the problem carefully

-> The problem has been explained carefully by our teacher.

5. They are going to buy this house

-> This house is going to be bought.