動(dòng) 詞 不 定 式
    不定式：to + 動(dòng)詞原形
    動(dòng)詞不定式的基本形式是“to + 動(dòng)詞原形”，有時(shí)可以不帶to。動(dòng)詞不定式(或不定式短語(yǔ))沒有人稱和數(shù)的變化，在句子中不能作謂語(yǔ)。動(dòng)詞不定式仍可保留動(dòng)詞的特點(diǎn)，即可以有自己的賓語(yǔ)和狀語(yǔ)。動(dòng)詞不定式同它的賓語(yǔ)或狀語(yǔ)構(gòu)成不定式短語(yǔ)。如：to read the newspaper, to speak at the meeting 等
    動(dòng)詞不定式具有名詞、形容詞和副詞的特征，因此在句子中可以作主語(yǔ)、表語(yǔ)、賓語(yǔ)、賓語(yǔ)補(bǔ)足語(yǔ)、定語(yǔ)和狀語(yǔ)：
    
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    注：作主語(yǔ)用的動(dòng)詞不定式常常為it替代，動(dòng)詞不定式(或短語(yǔ))放在后面。例如：
    It is not easy to learn a foreign language.
    It took us three days to do the work.
    動(dòng)詞不定式的否定形式由“not+動(dòng)詞不定式”構(gòu)成. 如:
    Tell him not to be late.
    The policeman told the boys not to play in the street.
    4) 不定式省去to的情況: 在感官動(dòng)詞see，watch，look at，hear， listen to，feel和使役動(dòng)詞make，have，let等所接的賓語(yǔ)中(不定式做賓語(yǔ)不足語(yǔ))，不定式應(yīng)省去to。但是在被動(dòng)語(yǔ)態(tài)中不能省。如：
    Let me listen to you sing the song.
    He watched his son play computer games.
    I saw him run away.------He was seen to run away.
    The boss make the workers work the whole night.----The workers were made to work the whole night.
    5) 動(dòng)詞不定式和疑問(wèn)詞連用
    動(dòng)詞不定式可以和疑問(wèn)詞what ,which, how, where, when 等連用，構(gòu)成不定式短語(yǔ)。如：
    The question is when to start.
    I don’t know where to go .
    He showed me how to use a computer.
    What to do is a big problem.
    例題解析：舉一反三，學(xué)的更輕松!
    翻譯下列句子，說(shuō)出句中不定式的作用：
    1. To grow plants is very important.
    2. It is so nice to hear your voice.
    3. My dream is to be a pilot.
    4. He began to read and write at the age of five.
    5. The teacher asked me to speak more loudly.
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