Martin is good at fishing,____?

问题描述:

Martin is good at fishing,____?
填空应该是:isn't he,还是doesn't he?

isn't he.
这是考反义疑问句的前后搭配,即前后的语法结构要一致.
前面是be动词结构,后面也用be动词.前面是is,后面就是isn't.
前面用助动词,后面才用助动词.比方说,假如这个句子改成
Martin does know fishing,doesn't he?
是这样用.