All you need to do is (to) fill in this form.中to为什么可有可无?是什么语法现象?
题目
All you need to do is (to) fill in this form.中to为什么可有可无?是什么语法现象?
答案
前面有to了后面的可以省略
动词不定式是由“to+动词原形”构成的.在实际运用中,小品词to在某些场合会被省略,下面简要归纳一下这些特殊情况.
1.在某些表示感官的动词(组)如fell,listen to,hear,look at,see,watch,notic等的复合宾语中,动词不定式不带to.例如:
We often hear her sing this song.
我们经常听到她唱这首歌.
I saw him play basketball.
我见过他打篮球.
2.在使役动词make,let,have等的复合宾语中,动词不定式不带to.例如:
Now let me hear you play.
现在让我听你演奏.
They made him work all day.
他们让他整天工作.
注意:上述两类句子若是变为被动语态,则原来作宾语补足语的不定式须带to.例如:
She is often heard to sing this song.
He was made to work all day.
3.动词help的复合宾语中,动词不定式既可带to,也可不带to.例如:
Will you help me learn English?=Will you help me to learn English?
4.help后面的动词不定式作宾语时也可省去to.例如:
Then he helped sweep the floor.
那时他帮助扫地.
The new policy has helped raise his wages.
新政策使他提高了工资.
5.当两个或两个以上不定式短语连用而且作用相同时,那么除第一个不定式短语用to外,其余的不定式短语可省略to.例如:
This article is easy to read and understand.
这篇文章浅显易懂.
He taught us to read and write.
他教我们读书、写字.
但是,若是在对照的场合(即强调对比)时,则不可省去to.例如:
It is better to laugh than to cry.
笑比哭好.13:26 2009-5-10ryedu.net
6.在had better,would rather,why not…固定结构中,动词不定式不带to.例如:
You’d better go home now.
你现在最好回家.
She would rather stay here.
她宁愿呆在这儿.
7.当介词but,except,besides前面有一个实义动词do时,不定式在介词之后可省去to.例如:
We can do nothing but wait.
除了等待之外,我们别无办法.
What do you like to do besides play piano?
除了弹钢琴之外,你还喜欢做什么?
8.如果不定式作表语,且主语部分有all,what,only或是最高级形容词修饰的名词和实义动词do时,作表语的不定式可省去to.例如:
All you need to do now is have a good rest.
现在你所需要的是好好休息.
What I want to do is finish my homework.
我要做的是完成作业.
The best way to do is wait till she returns.
最好的办法是等她回来.
The only thing you can do is sleep.
你惟一可做的只有睡觉了.
举一反三
已知函数f(x)=x,g(x)=alnx,a∈R.若曲线y=f(x)与曲线y=g(x)相交,且在交点处有相同的切线,求a的值和该切线方程.
我想写一篇关于奥巴马的演讲的文章,写哪一篇好呢?为什么好
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