英语：这里为什么要用have been 呢

来源：学生作业帮编辑：神马作文网作业帮分类：英语作业时间：2024/09/30 01:36:20

英语：这里为什么要用have been 呢
for men accustomed to sleeping between fine linen sheets at home,the change to the Alps must have been very hard 对于喜欢了睡亚麻床单的人来说来到阿尔俾斯山区生活一定很艰难

现在完成时,指过去发生并且已经完成的动作对现在造成影响或后果,过去某一时间开始并一直持续到现在并且有可能还会持续的动作或状态.

英语：这里为什么要用have been 呢英语：这里为什么要用have been He has been to Canada. So have I. 这里为什么不是 So has been I 呢 He has been to Canada.So have I.这里为什么不是 So has I 呢 how long have you been in china中为什么要用have呢? i have not been to shanghai.这句英语为什么要用 been It's+been++a+long+time.been在这里起什么作用?为什么要用been They have been married for 20 years.为什么要用被动语态呢? I've been to the house.这里为什么不用I've went to the house呢,have b 英语：He has already been warned of them.这里为什么要在warned前面加上been. I have been sick since yesterday.中have been 是什么是时态为什么要用been. have you been to an aquarium?这里为什么要加an?