He studies English very well and 后面跟good at swimming还是is good at swimming

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He studies English very well and 后面跟good at swimming还是is good at swimming

is good at swimming.
因为and引导并列句,如果省略第二部分的谓语,而与第一部分共用谓语,那么谓语必须能够同时适合两者.
这句话,前半句谓语是studies,无法与后面的good形成细表结构,所以,必须用is.
请采纳

跟is good at swimming
因为and前后需要连接两个相等的成分,如果前面的study不能做and后面的成分的谓语,那么就需要重新填一个谓语,所以必须带上is,做谓语

is good at swimming
因为短语是BE GOOD AT