`27`. You should not spend time hanging out with him.
`->` spend + time/money + Ving: dành tiền/ thời gian làm gì
`28`. Girls often spend hours (on) buying new clothes.
`->` spend + time + Ving/ on ST: dành thời gian làm gì/ vào việc gì
`29`. What about having a cup of tea ?
`->` Let's + Vinf = What about + Ving : câu mời rủ
`30`. How about going to the cinema together ?
`->` How about + Ving = Why don't we + Vinf : câu mời rủ