1, I haven't been here before.

=>Thì hiện tại hoàn thành

2, Bill asked if I wanted to buy any second hand books.

=>Câu gián tiếp dạng yes-no questions

3, My father works for a company which makes car.

=>Câu mệnh đề quan hệ

4, Although he had good salary, he was unhappy in his job.

=>Although+clause

5, It was such an easy exercise that all students could do it.

=>Cấu trúc such...that: quá...đến nỗi mà

6, He said he would go to Dalat the following day.

=>Câu gián tiếp lùi thì tương lai đơn: wil->would

7, This is the first time I have seen this film.

=>Thì hiện tại hoàn thành

8, They suggested we should leave the place at once.

=>Cấu trúc: S+suggested+S+should+V_inf+...

9, The Internet has been used as a means of education.

=>Câu bị động thì hiện tại hoàn thành

10, Unless we take a taxi, we will be late.

=>Câu đk loại 1