问题 It is...since...的主句与从句时态

It was three years since Jack had been a teacher.It is three years since Jack was a teacher.请问这两句有什么区别吗？分别是什么意思？第二句为什么不用has been呢？

问题 如何理解：What business is it of yours?

What business is it of yours? 请问这个句子是什么意思？特别是句中的 is it of 如何理解？

问题 of作定语和名词作定语的区别

stay on peaceful development path和stay on path of peaceful development有啥区别？这里的名词作定语和被修饰的path是啥关系？of短语和path是啥关系？

问题 一道中考模拟选择题

Life is long. You don’t have to be fixed on everything. Just give up something you cannot _______. Come on!A. succeed            B. manage           C. finish            D. deal这道题选 B. 为什么其他几个选项不对，好像意思也能解释的通，请...

问题 as 的用法（指代主句整句内容与部分内容）

...that?FEMALE PROFESSOR: Yes, the octopus can release a cloud of ink if it feels threatened, ah but it doesn’t hide behind it, as is generally believed.FEMALE PROFESSOR: Um the ink cloud is... it serves to distract a predator while the octopus makes its escape.请问老师，这里的as是...

问题 for sb与to sb (it looks gloomy to me)比较

—It’s a nice day, isn’t it?—Yes, but it looks gloomy to me.句子中的 to 可以换成 for 吗？

问题 这个是it + 动词 (+宾语或状语) + 从句 吗

Then I got really freaked out, and that's when it hit me: how much Barry looks like Mr. Potato Head.请问it是形式主语吗?还有就是 that's when 这个很难理解代表什么语法成分?谢谢各位大神解答!

问题 Really? Can’t it wait until tomorrow ?

Really? Can’t it wait until tomorrow ? 这句话为何是can't 放在句首呢？不是应该放在it 后面么？

问题 it is providing that是什么用法

And it is providing to be an increasing powerful tool in encouraging people to purchase. 这是北京高考真题阅读理解中的一句话，这里的 it is providing that是什么用法， providing在这里该怎么理解呢？

问题 分析: There could be no doubt about it.

There could be no doubt about it. 请问介词短语about it做什么成分？

话题 It和that

话题 it的指代问题

话题 it作形式宾语

话题 it代词指代啊

话题 It和one