All it would do is slow down the rate of change. (选自Public Attitudes Toward Science By Stephen Hawking)
译文:它所能做的只是延缓变化的速度。
请问老师,句中有两个动词,一个是表语is,另个一个动词slow down及后面的部分整体作表语。slow down 是动词原形,这样句子不是有两个谓语了吗?为何不用动名词slowing down,变为All it would do is slowing down the rate of change.
All it would do is (to) slow down the rate of change.
slow down是不带to的不定式作表语。当主语部分含有实意动词do的时候,做表语的不定式的to可以省略,而且通常省略。(不省略也不算错,省略更常见)。
如果主语部分的实意动词do是进行体,则表语通常用动名词。例如:What it is doing is slowing down the rate of change.
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