此两者都是表建议的句型,一般可以代换。类似的还有:
▲ Let’s…
▲ Shall I / we … ?
▲ How / What about … ?
Ⅰ. why not “好的、可以呀、为什么不可以呢?”如:
①--Mum, may I go out to play basketball now? –Why not?
③ Why not ask your teacher? 怎么不去问一问你的老师呢?
此外还可表一种不可理解的心情:
① --I won’t see the film again. – Why not?
Ⅱ. why don’t 是一种友好的建议(a friendly suggestion).无论在什么场合,使用起来十分亲切。后面接主语。如:
① Why don’t you go swimming? 为什么不去游泳呢?
② Why don’t I give Lily some colourful pencils? 我给莉莉一些彩笔,好吗?
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