=>
1. Social media networks are an excellent tool which you can use to promote your business.
2. You can buy the pasta from that Italian shop which/that has just opened in the high street.
3. I'll call the students with whom I went to London last summer.
4. That's the hotel where we stayed for our honeymoon.
5. I couldn't find the man whose case I'd taken by mistake.
which: đtqh chỉ vật
that: đtqh chỉ vật, người
whom: đtqh chỉ người (tân ngữ)
whose: đtqh thay thế tính từ sở hữu
