否定省略句why not…的用法一、why not的口语用法why not在口语中主要有以下用法:1.表示同意或赞成,意为:好的;可以呀;为什么不可以呢。如:A:May I go with you? 我可以和你一起去吗?B:Why not? 可以呀。A:Let’s eat out tonight. 今晚我们出去吃吧。B:Yes, why not? 那好啊。A:I wonder if I could make a living by writing. 我不知靠写作能否维持生计。B:Why not? 那可以呀。2.表示劝诱、建议或命令,意为:……怎么样;为什么不……呢。如:Why not ask someone else? 问问别人怎么样?Why not go there at once? 为什么不马上去呢?A:My girl-friend is in a bad mood. 我的女朋友情绪不好。B:Why not give her some flowers? 为什么不送她一些花呢?3. 用来询问原因(有时表示一种不可理解的心情),意为:为什么;为什么不……呢。如:A:He isn’t going to see her off at the station. 他不准备去车站送她。B:Why not? 为什么?A:You should not smoke. 你不该抽烟。B:Why not? 为什么?A:Don’t touch it. 别碰它。B:Why not? 为什么? A:It’s hot! You’ll burn yourself. 那是烫的,你会烫着的。4.表示坚持自己的观点、态度或做法,意为:为什么不呢。如:A:Are you really going to sue them? 你真的要控告他们吗?B:Yes, why not? 是的,为什么不呢? 二、why not后动词用何形式why not后习惯上只接动词原形,不能接带to不定式或现在分词。如:何不静观其结果呢?误:Why not just to wait and see what happens? 正:Why not just wait and see what happens? 你一脸倦容,怎么不休假呢?误:You’re looking tired. Why not taking a holiday?正:You’re looking tired. Why not take a holiday?注:在一定的语境中,有时why not后可省略动词原形。如:A:Let’s meet at the station. 我们在车站见面吧。B:Why not at the hotel? 在饭店不行吗? 句中的why not后可视为省略了动词wait。