关于这句话的困惑.he should be dead by May.到了五月,他应该已经死了.这里的BY为什么不能用AT替换呢?

关于这句话的困惑.he should be dead by May.到了五月,他应该已经死了.这里的BY为什么不能用AT替换呢? he should do his homework now这句话对吗?he should （ ）his homework now.A.does B.do c.is doing d.doing It is strange that he (should) have left withoutsaying doodbye .在这句话中should怎么翻译啊?为什么可以省?说一下should的用法 He wondered whether he should wait or not这句话有错误吗?wondered 用的是一般过去时,但是后面的should为何不用一般过去时“shall? 看这句话He should stop smoking.He should stop smoking.不是说should 后跟原形吗?为什么不是He should stop smoke. 关于这句话的困惑.THE BUSINESS OPENED IN 1990THE BUSINESS IS OPENED IN 1990我总觉得加个IS会好一点? 关于should省略的用法Without facts, a person can't form a good opinion, for he needs to have actual knowledge on which to base his thinking.请问这句话中,on which to base his thinking 相当于on which he should base his thinking的省略, 关于英语填空的题目( ) ( ) （令他困惑的事）is that he can't sleep well at night. he seemed to be quite as anxious as i .that i should see for myself he sawthat i should see for myself he saw这句话是什么意思,是什么样的结构呢.介词为什么用for 你的困惑这句话下面应该接句什么好.求大神,帮帮忙. 关于困惑的名言警句关于困惑的名言,名人说的 这句话有语法的错误吗?1,He pratices running for an hour every morning.2,The doctor advice is that he (should) eat. think否定前置I don't think he should play volleyball.I think he shouldn't play volleyball.这两句话哪个是对的? he insisted that he had not do anything wrong and that he should be set free 这句话有没有语法错误第一个从句不要用should 帮忙看一下这句话的语法结构What is more,imagine that your opponent has access to your files and what should be the main argument it could retire from it.帮忙分析一下这句话的语法结构,（比较困惑的是句尾部分 it could 这句话是虚拟语气吗?he suggested taht we should set off early.it was suggested that we should set off early.这句话的意思是什么？——我们本应听他的，但没听， for fear that引导的状语从句He wrote the name down for fear that he should forget it.这句话中从句为什么要用should do?是否是虚拟语气? 关于and 的并列问题,一直都是我很头疼的给几个例句,大家看看是怎么用（1）表示他应该做A、B两件事的时候,是He should do A and do B .还是He should do A and should do B.(2)表示做A、B两事很重要时,是It's