on sunday,we often go to the old people's home ( ) (help)the old peop 填help的适当形式

问题描述:

on sunday,we often go to the old people's home ( ) (help)the old peop 填help的适当形式

to help
动词不定式作目有状语

答案是【to help】

知识点:这里是用to不定式做目的状语,意思是,为了做.
翻译:星期天我们经常去老人家,(为了)帮忙他们.

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