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问题 if从句用虚拟语气而主句可以用陈述语气吗

If I learned how to drive a car, so can you. 要是我能学会开车，你也能。这个句子的条件从句是虚拟语气吧？而主句却了陈述语气，这样也行吗？即：if从句用虚拟语气而主句可以用陈述语气吗？

问题 关于there be句式省略主语的问题

...there be句式有时可以省略主语。如：There is a Mr Smith wants to see you.There is something keeps me worrying.并认为这里的 wants 前面省略了 who，以及 keeps 前面省略了 that。想请专家们分析一下这类句子的用法问题，这样的主语可以随便省略吗？...

问题 the crowd 和 the crowds 都是对的吗

似乎听说THE+可数名词单数=一类一群人/某物/某人但是在 BBC 6MINUTES ENGLISHI中听到了the crowds 的表达【原句】Now, apparently, in many stadiums, the crowds aren't singing as much as they used to.

问题 关于beyond后接what引导的是宾语从句的疑问

The test result was far beyond what we had expected, which brought great joy to everyone of us.what 在这里引导的是宾语从句么，做介词 beyond 的宾语么？

问题 Every year at Easter...的句子成分分析

前面一个问题（http://ask.yygrammar.com/q-28645.html）让我想另一个相关问题：Every year at Easter I went to see him.请问这里的 Every year at Easter 如何分析？两个都是时间状语？

问题 be looked at by sb的说法是否有误

I don't like to be looked at by the others. 我想问一下不及物动词加介词等于及物动词，那么比如上面这句, by和at都是介词这样写是否有误?

问题 have a good time in的用法

My mother despised inactivity. Seeing me having a good time in repose, she was powerless to hide her disgust.这个in是在..方面的意思吧？have a good time in sth 可以这么用吗？have time in sth能用吗?

问题 可以直接用动词原形作系动词be的表语吗

可以直接用动词原形作系动词be的表语吗The last thing we wanted to do is cause her any more hardship and emotional turmoil.这里为什么cause是原形？

问题 all this与all thes如何区别和理解

In addition to all this there was evolved the theory that light is an electromagnetic disturbance.句中all this 如何理解？ 为什么不是all these ? 既然用了all, 为什么后接this, 而不是these呢？

问题 desire 后面的that从句是同位语从句还是主语从句

It is our desire that every effort should be made to protect the environment.这句话是主语从句还是同位语从句？类似的句子如何判断？

问题 on such occasions在句中的成分分析

They had been invited to a Hindu wedding and were not sure what happened on such occasions. 请问老师（1）what引导的是什么从句？（2）on such occasions是时间状语还是地点状语，另外具体是哪种状语是靠语义区分的吗？

问题 关于并列句和复合句的疑问

...加上一个及以上的从句组合成的句子，那请问But when I got to the bus station, the bus had left这个句子中，连词连接的是一个主句一个从句这种情况，叫什么句子呢？

问题 since doing 和 since having done 用法疑惑？

The United States has reduced its forces there to around 8600 since signing the deal with the Taliban in February.这里的since signing...意思是自从签署了...那么为什么不用since having signed 完成时呢？

问题 deny放句首的倒装问题和词的用法

Deny law enforcement the ability fully to investigate a terrorist attack that killed 14, or……要么拒绝为执法部门提供协助，对一起造成14人死亡的恐怖袭击进行全面调查；要么……本句deny是倒装？怎么理解这个词在本句的用法？？

问题 定语从句的并列省略问题（some of whom ）

During this period, researchers interviewed nearly 3,000 women, some of whom had learnt to read as children, some during the literacy crusade and some who had never learnt at all. 请问后面定语从句的并列省略有没有问题？应该怎样修改？