All she wants to do is (stay) at home to care of her mom.括号里的单词形式用的对吗?

题目

All she wants to do is (stay) at home to care of her mom.括号里的单词形式用的对吗?

答案

用的正确√
当系动词前有动词do 时,作表语用的不定式常省略符号to,记法：有do 无to,
可省略的原因：因为前面有do,所以可以判断表语是一个动作而非一个名词.如没有do 动词,这个to就不能省略,因为会产生误会.
如All I want is to work.我只想干活.
如省略to,All I want is work.这工作是名词还是动词呢?应看成名词,那就是：我只要活儿（不要钱儿）.而All I want to do is work.这work前省了to,从主语可以出,这个work只能是省略了to的不定式.我想要做的就是干活.
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