Jack's cousin and he （ ）(not be) good at sports.

Jack's cousin and he （ ）(not be) good at sports.
Jack's cousin and he （ ）(not be) good at sports.

Jack's cousin and he （ ）(not be) good at sports.
are not = aren't

are not

isn't
有两个主语的，选择谓语一般采用临近原则，本句中谓语离he近，故谓语跟he走，填isn't
望采纳！

Jack's cousin and he are not good at sports.此处and 表示并列，为复数。
杰克的堂哥和他都不擅长运动。