1. They try to learn English to get a good job in the future. - nối 2 vế bằng to, bỏ chủ ngữ trùng lặp và verb want (want giải thích cho try to learn English nên xem như trùng lặp)

2. What time do you often have dinner? - đặt câu hỏi dưới dạng thì HTĐ
3. What does he like?  - đặt câu hỏi dưới dạng thì HTĐ

4. It was not until she received a letter from him that she wrote to him.

Trong trường hợp câu 4, It was not until đứng đầu câu ; phrase sau until là she received a letter from him đứng theo sau ; cuối cùng thêm that và chuyển didn't write → wrote.

5. It was not until they watched the end of the film that they surprised.

Cấu trúc: It was not until + từ chỉ thời gian/mệnh đề/phrase + that + S + V

Trong trường hợp câu 5, It was not until đứng đầu câu ; phrase sau until là they watched the end of the film đứng theo sau ; cuối cùng thêm that và chuyển weren't surprise → surprised.