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问题 动词hide与主语是被动关系吗

Hidden behind a tree, the boy could not be found.这个句子是过去时吗？分词部分不能确定时态，could 和 can 都能用在现在时，请问老师这种情况怎么判断时态？Boy 应该是自己藏起来的呀，怎么用过去分词呢？

问题 英语难句语法分析

The human genome contains 3 x 109 base pairs of nucleotides, including 140000 genes, if any one of these genes mutate, may lead to its coding protein structure and function unusual, and also cause a kind of important disease, genetic disease. 老师，麻烦您帮我看一下这句话的语...

问题 不定式省略to的用法问题

Much of the language makes it sound like a precise science.  其中 sound 前是否省略了不定式符号 to？为什么可以省略不定式符号 to？什么情况不定式作宾补可以省略不定式符号 to 呢？谢谢!!

问题 这个句子也是省略了主语it吗

看到前面有网友提到句子可以省略主语 it。我也有一个句子，好像是省略了 it，但又说不通，请老师分析一下，谢谢！Isn’t posting the letters your work?

问题 英语中逗号、分号、句号的区别

If you lose your job, I’ll lose mine; so we’re both in the same boat. 假使你失业，我也会失业，所以我们是“难兄难弟”。请问：这个句子 so 前面为什么用分号？这个分号用得对吗？为什么不用句号或逗号呢？在类似情况下，英语中逗号、...

问题 句末的a changed man是什么成分

My father came back from the war a changed man. 请问这个句子中的 a changed man 是什么成分（不会是状语吧）？整个句子是什么意思？

问题 hear sb do/doing的区别

We often hear some students ____ spoken English in the English corner.A. practice  B. practicing根据语境感觉填B合适，但是又觉得AB两个都可以，盼望专家老师解惑。

问题 what可以引导非限定定语从句吗

North Korea fired four ballistic missiles in the early hours of Monday morning, in what Japan's leader described as "an extremely dangerous action."上句中的what引导的是非限定定语从句吗？

问题 including等于which include吗

It’s best to contact a guide to learn about accessing these falls, which include those further upstream in the Seven Sisters group.上文中的 which include 可以换用 including 吗, 是所有的 including 都可以换成 which include 吗？谢谢老师回答。

问题 定语从句和同位语从句的判断

Singapore has a land reclamation project that builds up additional land from the sea floor.这句话从that充当成分来说是定语从句，但是感觉意义上that的引导的句子是对project的解释说明。那么到底是什么从句呢?

问题 sand的复数形式用法

Once the sands have run out of a person's hourglass, they cannot be replaced. 1. sand 作沙子时是不可数名词，但是这句的意思是沙子从沙漏计时器中跑走了，怎么用了-s复数形式。我看算了网上有的说法是强调一粒粒沙子，是这样么?2. sands ...

问题 如果理解句子中的but that

He also agreed to tell the Stapletons that Homes and I had gone to London,but that we would return to...老师，如何理解but that? 是另一方面的意思吗，表转折吗？这是个副词短语吗？

问题 make it to...是什么意思

专家请看以下句子：Joanna has finally made it to the first rank of celebrity after 25 years as an actress.【乔安娜当了25年演员后，终于跻身一线女明星之列。】请帮我分析这个句子的结构，谢谢！ 

问题 句首状语中用现在分词与过去分词的区别

Bathed in the warm sunshine, we entertained us with stories, songs, dances and games.  这句话中，Bath 为什么不是用的 bathing 呢？

问题 mean的用法（其后that的省略）

Not because I didn’t care about what had happened, but because the enormity of it meant it was simply too difficult to immediately process. 请问it meant后是不是省略了that?