提建议的英语句子?

提建议的句子：What/ how about +doing sth.如：What/ How about going shopping?Why don’t you + do sth.如：Why don’t you go shopping?Why not + do sth.如：Why not go shopping?Let’s + do sth.如：Let’s go shoppingShall we/ I + do sth.如：Shall we/ I go shopping?

shoud suggest that