the room is in the terrible mess ,it can not have been cleaned .为什么用can not have been为什么不用should not have been

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• 语法题高中的don't bother me.do what you(will);i don't care.为什么不用would likeit has been suggested that people who watch television incessantly(may become)over passive.为什么不用should becomethey (may have arrived )home by now.let's telephone them again.为什么不用must arrivedavid is waiting alone in the waiting-room.you(ought to have told)him yesterday about the change.为什么不用ought to tell(can)anybody else give correct answers to these questions?为什么不用musthe told me i (mig
• 几道不知如何解释的英语单选题1、please do _____you have been told to.A but B for C as D so that 为什么不选b呢）2______it is so early,I don't think we should go now.A although B if C as D that (答案为a,为什么不选c呢）3 I have a letter____,so I can't go to see a flim with you .A to write B to be written C written D writing 为什么不选a呢）
• that you have ever been in * can not change my decision这句话前面为什么用that 而不用what?不是少了个宾语吗?
• Has all that can be done been done?为什么用HAS 不用 HAVE PEOPLE也是整体,动词用复数先换成陈述句＝all that can be done has been done主语＝all 定语＝that can be done谓语＝has been done（被动）转换成简单的主句＝all has been doneall 作为一个整体,集合名词所以用单数我的意思是为什么用HAS 不用 HAVE PEOPLE也是整体，动词用复数 that为主语的话，无论that指的是单数还是复数，谓语动词都要用单数？
• the room is in the terrible mess ,it can not have been cleaned .为什么用can not have been
• the room is in the terrible mess ,it can not have been cleaned .为什么用can not have been
• 提问,英语的一些单词、短语、句型用法1、We are all here waiting for Miss Green to come 为什么用to come2、I saw a big dog lying under the tree when walking past the shop为什么不用was walking3、All has been done now.We can go.这里为什么用has?是All为不定代词还是将All看为一个整体还是什么?4、The students were all tired,but none of them stopped to have a rest-Do you want an apple,a banana or a pear?-None,they all look bad为什么用none,不是人和物吗?5、I think he must be in the office now,isn't he?是否情态动词反意疑问句都用be动词?
• the room is in the terrible mess ,it can not have been cleaned .为什么用can not have beenWith all the work on hand ,he could not have gone to the cinema last night.为什么用could not have gone 而不用 should not have gone.Eve was late for class again ,she should have got up .为什么用should have got up而不用 must get up 如果must get up 中变成must be get up 可否you should bear in mind that he is not so strong as he used to be 为什么用 used to be 而不用was used to be
• The room is in a terrible mess；it（ ）have been cleaned for a long time书后答案是写的 mustn't 但是网上很多解释是应该填写can't 比较纠结,到底填写什么啊?
• the room is in the terrible mess ,it can not have been cleaned .为什么用can not have been为什么不用should not have been
• 我喜欢画画.用英文怎么说?
• 证明:函数ƒ(x)=x+a/x(a>0)在(0,根号a]上减函数,在[根号a,+∞)上是增函数