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10.5 情态动词+现在完成时的用法
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很多时候，情态动词之后跟现在完成时，表示对过去事情的猜测或思考等。情态动词之后的现在完成时其基本表达为have done，其中的have没有人称和数的变化。如：
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I can (或could) have made it, but I didn’t try my best, so I feel regretful.
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我本可以成功的，但我当时并没有尽力，所以我感到懊悔。（can或could+现在完成时表示“本可以做某事”，而实际上当时并没有做）
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No matter what a person’s past may (might) have been, his future is spotless.
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不管一个人过去可能曾是什么样子，他的未来是一尘不染的。（may或might+现在完成时表示“可能做过某事”，是对过去的猜测）
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God must have made every human being with a different intention.
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上帝创造每个人一定是出于不同的目的。（must +现在完成时表示“一定做过某事”，是对过去语气非常肯定的猜测）
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She can’t (或couldn’t) have succeeded by luck because she made every effort possible.
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她是不可能靠运气成功的，因为她付出了全部努力。（can’t或couldn’t +现在完成时表示“不可能做过某事”，是must +现在完成时的否定表达。注意：英语中不使用must not +现在完成时）
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How I regretted the hours wasted in the woods and fields, the days when I had played and should(或ought to) have studied.
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我多么后悔浪费在树林和田野里的时光，那些我本该读书却只顾玩耍的日子。（should或ought to +现在完成时表示“本该做某事”，而实际上当时没有做）
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If you doubt his ability, you shouldn’t (或ought not to) have hired him in the first place.
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如果你怀疑他的能力，你最初本不该雇用他。（should not或ought not to +现在完成时表示“本不该做某事”，而实际上当时做过）
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Often when you look back, you feel that you needn’t have worried so much because a lot of things really didn’t matter.
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往往当你回首往事时，你会感到自己本来不必忧心忡忡，因为很多事情实际上无关紧要。（need not +现在完成时表示“本来不必做某事”，而实际上做过）
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实践演练
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Ⅰ.按照汉语提示写出对应的情态动词。
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1. Reading (应该) be enjoyable.
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2. Real wealth is being able to avoid doing what one (宁愿) not.
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3. A great book (不必) even be a best seller in its own day.
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4. Whoever battles with a monster (最好) see that it does not turn him into a monster.
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5. Men (可能) doubt what you say, but they will believe what you do.
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6. A strong man (愿意)struggle with storms of fate.
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