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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 This is the first time that从句时态

我们都知道This is the first time that从句时态常用现在完成时，请问还可以用别的时态吗，比如一般现在时？

问题 请问what a challenge that is!在句子中是宾语从句吗

we all know what a challenge that is!请问这个是省略了that 的宾语从句吗，what a challenge that is作为感叹句还是what引导的宾语从句，what作为定语修饰 a challenge谢谢各位老师

问题 man, woman 用不用冠词的问题

man 和 woman 作为可数名词，它有时前面不用冠词，觉得很奇怪。如：Man has a free will. 人有自由的意志。Man is engaged in a constant struggle with Nature. 人与大自然进行不懈的斗争。麻烦老师解答一下，谢谢！

问题 than在句子中作连词还是介词

It is better to live your own destiny imperfectly than to live an imitation of somebody else’s life with perfection. than加不定式做介词短语作状语吗？

问题 句子分析

"It's lucky for you I'm the one you met," the man said, smiling. "If it had been that criminal with no police around, he'd probably have twisted your neck."have been后面是不是省略了谓语动词？

问题 the key to success is to be ready at beginning.

The key to success is to be ready at beginning.老师，这里为什么用to be ready不能写成 the key to success is ready at beginning吗？

问题 Given is/are 用在句首是什么意思

Given is/are 用在句首是什么意思？例句：Given also are the time periods, which set the long-term problem in years.

问题 让步状语从句倒装后用不用冠词

...he was, he was unhappy. 他虽是国王，但他并不幸福。Child as he is, he knows to help other. 他虽然是个孩子，但知道帮助别人。Teacher as Michael is, he is not capable of teaching all subjects. 迈克虽是老师，但他也不能教所有的科目。我的疑问：如果名...

问题 Momma says stupid is as stupid does.的翻译与理解

Momma says stupid is as stupid does.这是高中英语新教材译林版必修2第1单元的句子(p12)。有人将 Stupid is as stupid does 翻译成“傻人有傻福”，也有人将它翻译成“做傻事的人才傻”，到底哪个是对的啊？求教各位专家老师！

问题 关于no loss of的疑问

...ptember 14, 1968, the Soviet space program sent two tortoises — along with some flies and worms — into space for a trip around the moon. NASA calls it "the first successful circumlunar mission carried out by any nation."After a week-long trip, the tortoises landed on Earth by parachute in the...

问题 since（自从）的主句谓语动词可以终止性动词吗

Since I left school, my parents have started to treat me like an adult. 自从我离开学校后，父母就开始把我当大人看待了。since 的意思是“自从……以来（一直）”，从理论上讲与它连用的主句谓语动词应该是持续性的才对。但本句中的 start ...

问题 这句话的either是什么用法(如何翻译)

...ed to reach me, they'll either text me, and then that text will come up on my computer.我自己查字典比较复合的书，是副词1.也，用于否定2.补充说明，而且感觉俩个都不咋恰当，请问这些小词该怎么去学习呢？就是大量的听，大量的接触，变的熟...

问题 英语长难句中的并列结构分析

...on of snowbound isolation within a vast architectural agora, a place where you can hide but you can't run.请问句子高亮部分是三个并列的什么成分, 谢谢!

问题 This is after...用法疑问

This was after the eu granted the government a short extension to the date on which Britain will leave, which could be April 12th if the withdrawl agreement struck between May and the eu does not pass Parliament.老师好，this is..是表语从句吗？我怎么觉得after缺主句呢？