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问题 这道题一点思路都没有了

It was not until man had learned how to make iron and steel that the constructionof various machines _ possible.A.were madeB.had madeC.madeD.was made请老师帮我仔细划分句子成分再逐一给四个选项解答，最后在详细说明not until的用法，谢谢。

问题 ing做主语和to do做主语的区别

Missing the train means waiting for another hour.这句话的missing 可不可以改成 to miss。ing做主语和to do 做主语有什么区别。

问题 同一个句子三个that的作用

Although scientists have known for a long time that about 2% of people suffer from face - blindness, which means that they have huge problems recognising faces, they are only new realising that some people are the exact ones.这三个that的作用是什么呢？

问题 非谓语动词done和being done辨析

The man kept his eyes ____ on his baby for quite some time.A fixed   B being fixed请问这里为何用A ，非谓语动词做宾语不是只能用to do 或 doing 吗？

问题 From …to…自身之前是否存在修饰关系

...好了呢 老师能否以例句解释 How far it is from your house to the office

问题 介词短语是做状语还是定语

The globalization of education means more universities will be seeking heads with international experience of some kind to promote international programs and attract a global student body.句子有些复杂啊！with international experience of some kind 介词短语是做状语还是定语？ ...

问题 Death NET 在这里做什么成分

句子：He sent it on via the group's on-line service, Death NET.我分不清"Death NET"在这里做同位语还是on的宾语。我猜分析他的关键应该在on，取决于它是副词还是介词。到这里我就有点分析不出来了。向各位请教。

问题 这里的非谓语具体是做什么成分呢？

Despite official data showing the unemployment rate was 6 percent in April, up to 10 percent of people officially employed in China could actually be out of work，

问题 There be 句型中 there be 做什么成分

1.There was a river which crossed the area from north to south.中there be 是什么成分？2.there be 都可以做什么成分？谢谢

问题 形容词分析

...as banking,telecons, and air travel ,information protection is now high on the boss’s agenda in businesses of every variety.这里的形容词为什么要用逗号呢？是因为都是观点（主观）形容词嘛？如果是的话意思就是用多个观点形容词都要用逗号隔开吗？

问题 letters后面是省略了关系副词吗？

Chinese President Xi Jinping and Nepalese President Bidya Devi Bhandari jointly announced the new height of Mt. Qomolangma, which is 8848.86 meters, in letters they sent to each other on December 8.老师您好，请问这里的letters后面省略了引导词吗？是where吗，引导定语从句。

问题 在a day前为什么不用in

An apple a day keeps the doctor away.在这个句子里“a day”前为什么不用in呢？ An apple， a day都是名词性的词组能连在一起用吗？

问题 复杂语法结构(a broken man作状语吗)

He returned from the war a broken man. 他从战场上回来，整个人都垮了请问这句话中的a broken man是怎么回事? 是什么语法现象呢?有没有其他的例句呢?

问题 这个句子可以单独提问吗（前面没有任何句子的条件下）？

What about  he? What about  the dog?1.这个句子可以单独使用吗（前面没有任何句子的条件下）？2.这个句子意思等于What is  he(it) doing? 吗？

问题 find不定式作宾补

Of course I was disappointed when I heard the news about her. I had always found her life to be so inspiring.在find sb/sth to be中好像可以省略不定式to be，但是为什么能省略to be呢？？如果是to do应该是不能省略的吧，比如We found her blood to contain poison。