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助动词do有do, does和did三种形式，在句中可以和实义动词一起构成否定和疑问，也可以用于对动词的强调以及代替前面出现过的动词以避免重复。
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do构成否定
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Don’t value money for its own sake, but for what you can do with it.
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不要看重金钱本身，而是看重它的应用价值。
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The past doesn’t equal the future.
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过去不等同于未来。
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If you don’ t learn how to use pain and pleasure, life controls you.
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假如学不会如何利用痛苦和快乐，你就只能任由生活摆布。
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do构成疑问句
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Do you believe that you will succeed by luck?
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你相信自己会凭运气成功吗？
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Does he believe in himself?
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他相信自己吗？
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Why do many of us struggle with work?
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为什么我们有很多人工作起来勉为其难呢？
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do用于代替前面出现过的动词以避免重复
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Difficulties strengthen the mind, as labor does the body.
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困难磨练意志，劳动增强体质。（does 代替strengthens）
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When you expect things to happen, often they do.
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你期望事情的发生，往往事情就会发生。(do 代替happen）
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It takes less time to make a better decision than it does to correct a poor decision. (does 代替takes）
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做出更好的决定所用的时间比改正糟糕的决定所用的时间少。
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C. 助动词have
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助动词have有has, have和had三种形式，和实义动词一起构成完成时态。
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He has achieved success who has lived well, laughed often, and loved much.
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