DO more exercise and breathe more fresh air,which is beneficial to us.这句话对吗?如果把逗号去掉连成一句话要怎么改?

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DO more exercise and breathe more fresh air,which is beneficial to us.这句话对吗?
如果把逗号去掉连成一句话要怎么改?

不对
DOing more exercise and breathing more fresh air are beneficial to us.
楼上的:由and连接的两个(或多个)动名词或不定式做主语,如果并列的动名词或不定式语义相同或相似,谓语用 单数;如果语义不一致,则谓语用复数.所以我认为你的那个用it不合适.

it's beneficial to us to do more exercise and breathe more fresh air.