Hoà hợp 2 câu đơn thành 1 câu phức có dùng mệnh đề quan hệ.
1: This morning i met a man. He gave me this book
2: This is a good film. It talk about Vietnam
3: He alway gots bad mark. That make him sad
4: The music was very loud. That made us very crazy
=>
1. This morning I met a man who gave me this book.
2. This is a good film which talks about Vietnam.
3. He always got bad mark, which makes him sad.
4. The music was very loud, which made us very crazy.