非谓语动词重要句式归纳—why not句式
why not后习惯上接动词原形，不能接带to不定式或现在分词，主要用于表示同意、赞成、劝诱等，其意为“为什么不……呢”。如：
A：May I go with you? 我可以和你一起去吗?
B：Why not? 可以呀。
Why not try again?干嘛不再试呢?
Why not use both? 何不两者都用?
Why not ask someone else? 问问别人怎么样?
But why not write him from Lisbon? 干吗不从里斯本给他写信?
Why not meet and discuss it? 我们碰个头讨论一下这件事不行吗?
You’re looking tired. Why not take a holiday? 你一脸倦容，怎么不休假呢?
Why not wait till the winter sales to buy a new coat? 为什么不等到冬季大贱卖时再买一件新外衣呢?
If you have to go to the dentist, why not go at once and get it over? 你要是必须去看牙医，为什么不马上就去，一了百了呢?