这里有一个句子:
What parents need to do is praise their children for good behaviour.
类似的,what we should do is try our best to do our curren job.
为什么is 后不用v-ing形式而用原形?提取主干难道不是what……is doing?
还是is 后省略了一个to?如果是,为什么要省略?涉及何种语法?
另外,还有一个类似句子:
what we should be doing focusing on the job we are currently in now.
为什么此处is 后用v-ing形式?
望高手解答!
抱歉,第二句漏掉了is
应为what we should be doing is focusing on the job we are currently in now.
不好意思,第二句的确漏掉了is
你说第一句“;因为前面有实意动词 do,所以可以省略 to“
按这样说的话,第二句也有do的,为什么用v-ing?但是第一句却不行?
我上面已经说了,前后要一致的。第二句的前面没有to do,只有be doing,我们仍看做是 doing,所以后面的用 doing.
第一句肯定没错,是教材原句
我是问为什么省略to?还有何种情况省略to,何种情况用v-ing?