act重要短语用法集注1. act as (临时)担任，充当，起……的作用。如：A trained dog can act as a guide to a blind person. 经过训练的狗可以担任盲人的向导。表示担任独一无二的职务，其前通常不用冠词。如：He acted as manager in my absence. 我不在时他担任经理。I don’t understand their language; you’ll have to act asinterpreter. 我不懂他们的语言，你得当翻译了。2. act for 代理(某人职务)，代为(处理某事)。如：Please act for me during my absence. 我不在时请代理我处理事务。I acted for our captain while he was in hospital. 我们队长住院时由我代理他。3. act out (用手势和语言)表演出来。如：Let’s act out the story of the three bears once more. 让我们再把这三只熊的故事表演一次吧。4. act on (upon) 对……起作用，对……有效。如：The drug acts on the stomach. 这药对胃有效。Alcohol acts on the nervous system. 酒精对人的神经系统有影响。5. in the act (of) 当场，正在动作时。如：He was in the very act of starting. 他正准备动身。He was caught in the act (of reading my private letters). 他(在读我的私信时)被当场抓住。

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