What I want to do is (to )tell you the truth. The only thing he could do was ( to) tell the truth. 如果主语中含有do的任何形式, 那么不定式可以省去to。 2、动名词做表语是对主语内容的解释,这时主语与表语位置可互换,动名词常用于口语中。 Its full-time job ...
I don’t know if /whether it is an interesting. (2) Does Cathy go to school early? Do you know? Do you know if /whether Cathy goes to school early? 注意:只能用whether而不用...
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