he devoted his life to helping the disabled

问题描述:

he devoted his life to helping the disabled
to helping to 后面不应该是动词原形么?
为什么要用ing

devote to 中的“to”是介词,不是动词不定式,所以接sth(名词)或者动名词即动词的ing形式,而不是接to do(动词原形)