something/smoebody/nothing等不定代词后面是加to do还是加doing?

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something/smoebody/nothing等不定代词后面是加to do还是加doing?
如：There is always something interesting --------(happen) there.填什么?

填happening,因为is是动词,happen也是动词,所以要用happening,因为是always,所以表示状态持续,不用todo而用ing形式
something/smoebody/nothing等不定代词后面是加to do
doing表示正在做或者状态持续

something/smoebody/nothing等不定代词后面是加to do还是加doing? there is something to do 还是doing 就是应该遵守be doing 还是不定代词加to do ask后面是加to do还是doing,还是do? Would you like 后面加to do something 还是doing something fear 后面是加doing?do?还是to do? find后面是加do还是加doing还是加to do? hard后面加doing还是to do refuse后面加to do 还是doing discover后面加to do还是doing? adjust to 后面加doing还是do? spend后面加doing还是to do? carefully 后面是加doing 还是 to do