名师指点：助动词DO的用法解析

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　　1. DO作为助动词时的时态、人称和数的变化与它作为本动词相同,有do, does, did三种形式。
　　Yes, it seems he doesn't really want to have a haircut.
　　是啊，他好像不是真的想理发。
　　Then, why does he come here?
　　那他为什么来这里呢？
　　Where did he go when he left here?
　　他离开这儿去了哪了？
　　2. DO+主语+原形动词构成疑问句。
　　How long do I have to wait?
　　我得等多久？
　　3. DO+not+原形动词构成否定句。
　　No, I don't want to wait that long.
　　不行，我不能等那么久。
　　4. DO(+not)+主语用于附带问句。
　　You want to have a haircut, don't you?
　　你想理发，是吗？
　　5. DO+原形动词用于加强语气句。
　　Yes, I do want to have a haircut.
　　是，我真的想理发。
　　6. Never (Only)+DO+主语+原形动词用于倒装句。
　　Never did I see such a strange man.
　　我从未见过这么奇怪的人。