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非谓语动词(3)

时间:2018-10-11 21:25来源:未知 作者:billgxl 点击:
I often help him (to)clean the room. I helped him (to) find his things. 作定语 不定式作定语,修饰名词或代词,不定式和它所修饰的名词之间有逻辑上的主谓关系、动状关系、同位关系或动宾关系。不定式通常要

            I often help him (to)clean the room.
            I helped him (to) find his things.
  1. 作定语
不定式作定语,修饰名词或代词,不定式和它所修饰的名词之间有逻辑上的主谓关系、动状关系、同位关系或动宾关系。不定式通常要放在这些被修饰的词后。如:
I have a lot of work to do.(动宾关系)
He is looking for a room to live in.(动状关系)
He is the first person to think of the idea.(主谓关系)
He has got a chance to go abroad.(同位关系)
注意:1.不定式的逻辑主语是句子的主语时,不定式用主动形式表被动。如:
      Do you have anything else to say?
         2.如果作定语的不定式是一个短语,则要保留不定时短语中的副词或介词。如:
          I need a pen to write with .  (I will wirte with the pen ) (我需要一直钢笔写字)
          I have a little baby to look after .(I must look after the little baby ) (我有一个婴儿要照看)
作状语,表示目的、结果、原因等,有时还有一些固定搭配的不定式短语,如in order to , so as to, so…as to, such …as to, ….enough to, too…to等。
  1. 做目的状语,to, only to (仅仅为了), in order to, so as to, so(such)….as to…(如此···以便···)如:
He ran so fast as to catch the first bus. 他飞快地跑以便赶上第一班车。
He came to the school to see his son.
  1. 作结果状语,表事先没有预料到的,要放在句子后面。如:
He hurried to the post office only to find it was closed.
He searched the room only to find nothing.
  1. 做原因状语。如:
We were very excited to hear the news.
I’m glad to see you.
  1. 做条件状语。如:
To turn to the left , you could find a post office.
  1. 作表语
不定式可放在be动词后面,构成表语。如:
The question is how to put it into practice.
My question is when to leave.
His dream is to be a doctor.
Her work is to look after the babies.
注意:1.不定式在句中作表语时,对应的谓语动词用单数。
      2.当助于是不定式时,表语不能用Ving形式,可用不定式。
       如:To see is to believe. (眼见为实)
  1. 独立结构。如:
To tell you the truth, I don’t agree with you.
To make matters worse, it began to rain.
  • 不定式的时态和语态
  1. 不定式的时态
  1. 现在时:有时与谓语动词表示的动作同时发生,有时发生在谓语动词的动作之后。如:
He seems to know this.    I hope to see you again.   (责任编辑:billgxl)
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