I think john raises a pet,doesn't he?
I suppose cats are ftriendly animals,aren't they?
I don't think he needs help,does he?
He guesses you keep an English diary,don't you
方法：首先判断反义疑问句反的是哪一层意思,比如说第一句,他想反问的不是"我是否是这样想",而是"JOHN是否养了宠物".这一层意思对应的句子其实就是“john raises a pet”.找到句子的主语,JOHN,发现可以用HE代替.谓语动词是RAISES,是第三人称单数形式,变为疑问句要用does.肯定句要变为否定句,则最后答案即为“doesn't he?”这里注意,判断句子的肯定还是否定时,需要通过意思判断,而不是句型来看.比如说第三个小题,逗号的前半部分是一个否定句,则逗号的后半部分就是肯定形式.