Mike is not good at English（改成同义句）
问题描述：
Mike is not good at English（改成同义句）
答
be good at反义词是 be bad at
同义词是 do well in
do well in 的反义词又是 do badly in
所以一楼的回答很正确。
答
Mike is poor at English
答
Mike is bad at English.
Mike doesn't do well in English.
Mike do badly in English.
以上三种提法都可以.