摘要:不定式由“to+动词原形 构成.其否定形式是“not to+动词原形 .不定式可以带宾语或状语构成不定式短语.没有人称和数的变化.但有时态和语态的变化.不定式可作主语.宾语.状语.表语和定语.但不能单独作谓语.1.不定式的时态及语态 时态 主动 被动 意义 例句 语态 一般 to do to be done 与谓语动词同时发生或以后发生 I’m glad to see you. 当不定式逻辑上的主语是这个不定式所表示的动作的承受者时.不定式须用被动形式.如:He asked to be sent to work in Tibet. This book is said to have been translated into many languages.[ 进行 to be doing 表示谓语的动作发生时.不定式表示的动作正在进行 He pretended to be reading a book when I came in. 完成 to have done to have been done 先于谓语动作发生 We seem to have met each other before. 完成进行 to have been doing 先于谓语动作发生而又延续到谓语动作发生后 He is said to have been studying abroad.but I don’t know which country he is studying in.

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