英语句式时态分析?It is (about/high)time that + 从句（过去式）/should do.为何+后用 过去时时态或 should do 结构?

英语句式时态分析?It is (about/high)time that + 从句（过去式）/should do.为何+后用 过去时时态或 should do 结构? 分析英语句式型,时态等.You wouldn't have met her if it hadn't been for me.尽量详细些, 英语.所有时态的句式. 问一道英语句式（初二）It is +时间 +（介词 ）+sb +（ 动词 ）.中间两个空,第一个用什么介词?第二个动词用什么时态? 新概念英语第43课there it is.是什么句式? 请分析下面英语句子结构及其语法现象：（还有the purpose of 是做it的什么成分?）The program leaders believe stongly in the progrom and say that the purpose of it is to give young overseas Chinese the chance to learn more abou it is the same today that it always was这一句怎么理解?分析一下句式结构, 英语如何分析句式句法 is that it 是什么句式 分析一句英语的句式结构The light source must therefore be immensely brighter if it is to be used as a headlight to illuminate the path,than if it is to be used as a signal to others.请英语达人帮忙分析下上面句子的句式结构 it is being shown now. 这句这么理解?从时态语态来分析 试分析英语句式：the future is not ours to see. 解释英语句式“It be +...+ since +...”,“It be +...+ before +...”谁能解释这两个句式有什么区别啊?（最好能举例分析.） 分析这个英语句子的时态和句意!it is／was 3 years since he came here.since不一定和完成时连用吗?用is或was有什么区别 为什么since不能用做that? 英语中哪种句式中需主从句时态一致 英语固定句式中的动词时态其中一种用法怎么区分It is 20 years since I came.It is one year since I came here.这里的came 和came here用法或者意思有什么区别?课堂上笔记没记全,（这是我高一侄女复习笔记 英语句式分析法包括句子成分,越多越好, 英文过去时的某些句子时态问题I saw all Beijing（这种句式对吗）.How beautiful it is/was?