情况如下
如果是否定变疑问,则
be动词,情态动词,助动词移到前面去.
She can't swim.Can she swim?
She doesn't do well in English.Does she do well in English?
She isn't a teacher.Is she a teacher.
如果疑问变否定
则先把否定句变成肯定句,再把肯定句中的be 动词或者情态动词提前就可以了,for example:he is not an active boy.变成 he is an active boy.变成 is he an active boy?
you can not help me.变成 you can help me.变成 can you help me?