朱思恩的女儿:[神马语法]初中版:100个句子轻松搞定初中英语语法-第50句

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50. Let’s go to the zoo!     我们去动物园吧!    
    一、由let带头的祈使句是个常见的动词句型,它的主要用法有下列三种:
    
    1)表示“建议”。
    
    这个句型里的let后头紧跟着一个第一人称的代词宾语,如:
    
    Let me try.
    
    Let's do it.
    
    Let me go and look for it.
    
    这个句型语气委婉,比直接的祈使句客气。试比较a、b两句:
    
    a. Don't disturb him.
    
    b. Let's not disturb him.
    
    a是直接命令,语气强烈,不如b温柔悦耳。
    
    2)表示“间接命令”或“愿望”。
    
    这句型里的动词宾语是第三人称名词或代词,如:
    
    Let Robert take charge of the marketing department.
    
    Let her join our choir.
    
    3)表示“警告”、“蔑视”、“威胁”等。
    
    这种祈使句里的宾语也是第三人称为主。除了口气凶悍之外,有时还语带讽刺,如:
    
    Let him try and he will expose his inability to work on his own.
    
    Let the invaders come and our armed forces will wipe them out in no time.
    
    二、用"let"的祈使句时,必须注意下列几点:
    
    1)let的否定句有二。如果宾语是第三人称用"Don't let.....";如果宾语是第一人称,则用"Let......not" ,如:
    
    Don't let this type of things happen again.
    
    It's raining now. Let's not go out until after the rain.
    
    2)let只适用于现在时态,可以有被动语态 (the passive voice),如:
    
    Let the recalcitrant criminals be sent to prison.
    
    Let all the dedicated capable staff be promoted.
    
    3)let后头除了是不带"to"的不定式动词之外,还可以是某些适当的副词,如out, in, down, alone等,如:
    
    Let the puppy out.
    
    Open the windows and let the fresh air in.
    
    The room is too sunny. Let the blinds down.
    
    Let me alone, please.
    
    4)用"Let's"时,把谈话者的对象包括在内;用"Let us"时,并不包括对方,如:
    
    Let's try it, shall we?
    
    Let us do it by ourselves, will you?