He with his friends usually_(play) football after school.

问题描述:

He with his friends usually_(play) football after school.

plays

同意楼上的

plays
因为with 后用单三
同意2楼的

他和他的朋友们常常在放学后踢足球

plays
一个句子的主语被with/together with/as well as等短语+n.修饰时 句子谓语的数根据前面的名词确定
这个句子就是he被with his friends修饰 所以play的数由he确定