不定式做表语省略了to吗
"Christmas has been commercialized out of its real meaning. The gifts people give have become a sort of advertising display. What we ought to do is give to people we love — give memorable things according to our ability. If you could give your child a horse, say, that would be fine. But if you can't, give her a little locket or a book of verse."
What we ought to do is give to people we love这个give怎么不带to，不定式做表语 省略了to吗？
最佳答案 2018-09-02 09:45
What we ought to do is give to people we love.
该句is 后的表语，是省略了to 的不定式（to give），但省略to 不是强制性的。
当主语部分含有动词do 的某种形式时，作表语的不定式可以省略to，例如：
All you need to do is (to) press the button.
你所要做的就是按一下按钮。
The first thing I do every morning is (to) take plenty of exercise.
每天早晨我所做的第一件事就是进行充分的体育锻炼。
What you have to do is (to) fill in in the form.
你所要做的是把表格填完。
不过，本句有一个错误，give 缺少宾语。在后面补充了宾语：give memorable things。
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