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构成复合宾语（多由名词或代词＋不定式构成）：
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They encouraged me to try again．他们鼓励我再试一下。
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I didn’t expect you to arrive so early．我没料到你来得这样早。
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He wants you to call him back at 11．他要你11点钟给他回电话。
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跟这种结构的动词也很多，常见的如：
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advise allow ask beg cause command compel encourage expect forbid force get hate help instruct intend invite like love oblige order permit persuade prefer press remind request teach tell urge want warn wish 有些动词（如feel，have，hear，let，make，notice，see，watch等）后的复合结构中不定式不带to：
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What made you think like that？什么使你这样想？
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Let me see．让我想想。
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Don’t forget to have him call me tonight．别忘了让他今晚给我打电话。
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甚至在look at和listen to之后也如此：
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Look at the boy run．瞧这个男孩儿跑。
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He sat listening to him climb the stairs．他坐着听他爬上楼来。
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但这类句子变为被动结构时，不定式的to不能不要：
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They were made to work day and night．他们被迫日夜干活。
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She was often heard to sing this song．人们常常听到她唱这首歌。
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作状语，可表示目的、结果、原因等：
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They ran over to welcome the delegates．他们跑过去欢迎代表们。（目的）
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What have I said to make you so angry？我说了什么话使你这样生气？（结果）
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We jumped with joy to hear the news．听了这消息我们高兴得跳了起来。（原因）
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在某些作表语的形容词后也可用不定式作状语：
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I’m sorry to hear it．听了这我很难过。
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She was surprised to find him there．她发现他在那儿很吃惊。
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We are eager to take part in the work．我们急于参加这项工作。
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能跟不定式的这类形容词很多，常用的如：
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able angry anxious apt ashamed careful clever considerate content cruel delighted destined disappointed eager fit foolish fortunate frightened glad grieved happy impatient inconsiderate lucky naughty quick pained prompt proud ready right rude shocked slow sorry surprised thoughtless unable unfortunate unwise willing worthy wrong 另外，不定式还可用作状语，修饰整个句子：
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