2015年卫生类职称英语考试备战已经开始了,这是小编整理的一些常见的语法,希望对您能有所帮助。滴水穿石,磨杵成针。每天进步一点,积累下来便是巨大的进步。
不定式的句法功能:
(1)作主语:
To finish the work in ten minutes is very hard.
To lose your heart means failure.
动词不定式短语作主语时,常用it作形式主语,真正的主语不定式置于句后,例如上面两句可用如下形式:
It is very hard to finish the work in ten minutes.
It means failure to lose your heart.
常用句式有:
1、It+be+名词+to do.
2、It takes sb.+some time+to do.
3、It+be+形容词+of sb +to do.
4、It+be+形容词+for sb.+to do.
常用careless,clever,good,foolish,honest,kind,lazy,nice,right,silly,stupid,wise等表示赞扬或批评的形容词,不定式前的sb,可作其逻辑主语。
(2)作表语:
Her job is to clean the hall.
He appears to have caught a cold.
(3)作宾语:
常与不定式做宾语连用的动词有:want,hope,wish,offer,fail,plan,learn,pretend,refuse,manage,help,agree,promise,prefer,如果不定式(宾语)后面有宾语补足语,则用it作形式宾语,真正的宾语(不定式)后置,放在宾语补足语后面,例如:
Marx found it important to study the situation in Russia.
动词不定式也可充当介词宾语,如:
I have no choice but to stay here.
He did nothing last Sunday but repair his bike.
动词不定式前有时可与疑问词连用,如:
He gave us some advice on how to learn English.
(4)作宾语补足语:在复合宾语中,动词不定式可充当宾语补足语,如下动词常跟这种复合宾语:want,wish,ask,tell,order,beg,permit,help,advise,persuade,allow,prepare,cause,force,call on,wait for,invite。
此外,介词有时也与这种复合宾语连用,如:With a lot of work to do,he didn't go to the cinema.
有些动词如make,let,see,watch,hear,feel,have等与不带有to的不定式连用,但改为被动语态时,不定式要加to,如:
I saw him cross the road.
He was seen to cross the road.
(5)作定语:
动词不定式作定语,放在所修饰的名词或代词后。与所修饰名词有如下关系:
①动宾关系:
I have a meeting to attend.
注意:不定式为不及物动词时,所修饰的名词如果是地点、工具等,应有必要的介词,如:
He found a good house to live in.
The child has nothing to worry about.
如果不定式修饰time,place,way,可以省略介词:
He has no place to live.
This is the best way to work out this problem.
如果不定式所修饰名词是不定式动作承受者,不定式可用主动式也可用被动式:
Have you got anything to send?
Have you got anything to be sent?
②说明所修饰名词的内容:
We have made a plan to finish the work.
③被修饰名词是不定式逻辑主语:
He is the first to get here.
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