句子意思：（现在）为什么不像过去经常做的那样去滑雪呢?
完整一点：Why not do (things that we) used to do as go skiing?
used to do固定搭配,表示过去经常做某事,这里作为do的对象,省略了things和that从句
所以,第三个单词do,在这里是表实义的动词.
在特殊疑问句 Why not do used to do as go skiing 中 第三个单词 do 在这里是助动词
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特殊疑问句的否定形式Why do I have to go to bed?如果变成否定句,NOT 应该接do还是have
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do的用法在一些特殊疑问句中do是为帮助提问的助动词,无实际意义.那么在句子中什么时候用这助动词do呢?
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在used to do句型里use是助动词吗、
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why not to do 还是why not doing
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是Why not to do 还是Why not do
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do只可用在疑问句中吗?助动词do只可用在疑问句或否定句中吗？