问题描述：
my parents always do what they can me when i am in trouble.其中do what they can之后省略了do,
请问什么情况下可以省略DO?
另外,we must do everything we can to help others.中,do everything we can 这句后也省略了DO.
请问什么情况下可以省略DO?
另外,we must do everything we can to help others.中,do everything we can 这句后也省略了DO.
问题解答：
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