英语，提建议的具体说法，最好全面一点

1. 用Shall we...?在表示建议或征求对方意见时，可用以Shall开头的一般疑问句。其肯定回答一般可用：All right, OK, Good idea等。
　　
2. 用Let's...?表示“让我们”（包括双方在内）做某事“这一建议时要用以Let's 开头的祈使句。而Let us在表示让我们做某事时，不包括对方在内。如：Let's go and see the pandas. Let us go, will you?让我们去吧，好吗？
　　
3. 用Why not...?Why not...?意思是：为什么不……？后接不带to的不定式（即动词原形）。Why not...?是省略了主语的省略形式，完整句Why don't you/they/we...?如：Why don't you go with me? Why don't you try again?=Why not try again?
　　
4. 用What about...?意为“……怎么”后可接名词、的代词和动名词。如：What about going out for a walk? I'm going to the park.What about you?
　　
5. 用had better 意为“最好”，“还是……好”，常用于口语，后接动词原形。如：You had better stay at home. You'd better go now.
　　
6. 用Don't...来表示建议，通常用于祈使句的否定形式中。如：Don't play in the street. Don't throw it like that.
　　
7. Would you like+短语？这个句型意思是“……怎么样？”后接sth. 或to do sth.如：Would you like another cup of tea? Would you like some colour pencils?
　　
8. Will you please+动词原形……？它的意思是“请你……好吗？”如：Will you please come tomorrow? Will you please pick it up?

why not、why don‘t you