关于两句英语的语法问题

问题描述:

关于两句英语的语法问题
Booking the hotel and the flight tickets is difficult.是不是这种情况都是就近
They have been to GW,haven't they不是说如果是经历的话就用didn't they吗

Booking the hotel and the flight ticket is difficult (不是就近,是表示一种概念作状语,谓语动单数)
They have been to GW,haven't they ( 反意思疑问句,主动词否定+主语 用法 ,所使用助动词与前面句子保持一致)haven't they?)但是我记得好像如果have后跟的是经历的话,后面是用do接的句子使用现在完成时态 ,助动词 has /have +动词过去分词,表示一种时态,后面反意疑问句,必须助动词+否定+主语(1)前面是肯定句,反意疑问句为否定 :反意疑问 助动词+NOT +主语(2)前面是否定句,反意疑问句为肯定 :反意疑问 助动词 +主语