1. We stayed in a very beautiful resort

`=>` The resort in which we stayed is very beautiful.

* Giải thích : câu này là câu mệnh đề quan hệ 

2. He hasn't drunk coffee for a fortnight

`=>` He last drunk coffee two weeks ago.

`=>` It is two weeks since he last drunked coffee.

3. Be careful or you'll make a terrible mistake

`=>` Unless you careful, you will make a terrible mistake.

hoặc `=>` If you don't careful, you will make a terrible mistake.

   Chúc bạn học tốt nha.

1. The resort in which we stayed is very beautiful.

(= THE RESORT WHERE WE STAYED IS VERY BEAUTIFUL) - MỆNH ĐỀ QUAN HỆ

2. He last drunk coffee two weeks ago.

(FORTNIGHT = TWO WEEKS)

It is two weeks since he last drunked coffee.

3. Unless you careful, you will make a terrible mistake.

(If you don't careful, ...) - UNLESS = IF NOT