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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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善于生活，时常欢笑，充满爱心的人已经取得了成功。
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If you have made mistakes, there is always another chance for you.
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即使你犯了错误，你总还有机会。
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Once we have clearly defined our thoughts, resources come to us.
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一旦我们对想法有了明确的界定，资源就会出现。
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By that time, the biggest lesson they had learned was the importance of thinking.
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到那时为止，他们最大的收获就是明白了思考的重要性。
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此外，will, shall, would和should也可以作助动词，表示将来时态，详见《动词时态》一章。
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d 情态动词是指表达说话者的情绪或者态度的词。情态动词本身有一定的含义，但需要和实义动词一起使用才能表达完整的意义。
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情态动词一般没有人称和单复数的变化，大部分也没有时态变化。情态动词之后跟动词原形。
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情态动词包括can, may, must, need, should, dare等，详见《系动词和情态动词》一章。以下仅举数例说明。
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You can do it if you believe you can.
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