doing exercise helps,为什么help要加s

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doingexercisehelps,为什么help要加sdoingexercisehelps,为什么help要加sdoingexercisehelps,为什么help要加sdoingexercise

doing exercise helps,为什么help要加s
doing exercise helps,为什么help要加s

doing exercise helps,为什么help要加s
doing exercise是动名词.凡是动名词做主语,当作单数,谓语动词要用单数,加s

因为doing exercise是单数的主语,谓语help就要加s