yes,he is,and his mother if my gym teacher.这句话对吗?

yes,he is,and his mother if my gym teacher.这句话对吗?
yes,he is,and his mother if my gym teacher.这句话对吗?

yes,he is,and his mother if my gym teacher.这句话对吗?
不对,是is吧,是不是卷子打错了