英语为什么用have't而不用hasn't：kate haven't got any brothers.

英语为什么用have't而不用hasn't：kate haven't got any brothers. He must have done his homework last night,didn't he? 这里为什么用didn't而不用haven't?错了 是 hasn't tom hasn't been to the Great Wall,has he?为什么回答用No,he hasn't而不用No,he has She doesn't have lunch at home every day,为什么不用hasn't he has hair cut every month,为什么答案是doesn't而不用hasn't He must have stayed up late last night,didn't he 这里为什么用didn't he不用haven't he 是 hasn't he It`s the first time that he has been to Australia,isn`t it?中,为什么要用isn`t it,而不用hasn`t he? donesn't have 可以用hasn’t 替换么?He doesn't have a mouth.doesn’t have 可以用hasn’t 替换么?为什么? I’m very disappointed with my neighbor.she said she would keep her cat off my grass.But she ()为什么用hasn't而不用didn't谢谢! 为什么有些反意疑问句关于have的很奇怪（英语高手请进帮下忙）例如 I think she has been to ……,hasn‘t she?中后面的疑问句中用hasn't而 He thinks she has been to ……,doesn't he?中后面的疑问句用doesn’t don't have a seat为什么要用don't而不用doesn't Everybody doesn’t have two hands.为什么用doesn’t 而不用don’t 为什么用 he doesn't have 不能用he hasn't 反意疑问句有什么规律吗?It must have been rainy,yesterday反意用wasn't it?而It must have been rainy反意为什么就用hasn't it? I wonder why Jenny hasn't written us recently.We should have heard from her by now.为什么这里不用hasn't written to us?write to sb.短语的to 可以省略? The reporter's already back from China safely,____he?为什么填isn't?而不用hasn't?前面的缩写难道不是has吗? You’d better go to see your sister,hasn’t you?疑问部分为什么用has 不用 had He hasn't been to the countryside;neither does he want to go there.He hasn't been to the countryside;neither does he want to go there.的neither后为什么用does啊不用has?不是有很多句子都是比如：He has been to Beijing.So have I.都