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问题 when/while doing

我想请教一下when doing sth这个结构是省略了（subject+be)的从句，还是是非谓语动词引导时间状语但是前面必须加when/while的这个结构？

问题 hold的意思

What the writer meant, I think, was singleness of mind, holding steadfastly to the purpose in mind, without being drawn aside by less worhty objects. 请问hold在文中怎么理解？

问题 what做什么成分

This holiday shows kids what it means to be a grown-up in the working world.what在句中引导的是什么从句，作主语还是宾语？

问题 动名词的复合结构

一个一直困扰我的问题：请问“动名词的复合结构” 或 “being动名词结构” 做主语，与主语从句（先不考虑it形式主语）  到底有什么区别？

问题 短语动词分析

use for看做vi+prep形式的短语动词，for后加名词做宾语，变成被动be used for，后面的for接宾语做目的状语，老师这样理解是对的吗？但是我想问一下变被动时use的词性是vt还是vi?不是不及物动词没有被动吗？

问题 动名词复合结构疑问

He coming home late worries his other.The weather being fresh allows my fishing.不应该做主语都用所有格吗？

问题 不定式的疑问

I take the trouble to return it.这里的不定式 to return 是在句中当副词做状语修饰take么？就比如 I want you to be happy.

问题 状语位置问题

The topic is being discussed by them at the moment.1.by them这个介词短语在这里是作什么成分呢？2如果句子同时含有几个状语，例如地点、时间、条件、原因、结果等状语，那这些状语的位置是怎么样的呢？就是哪个先哪个后？

问题 介词后接what从句

Be careful about what you say.这里的about是介词,那它后面的what you say是什么从句?介词后面不是不可以加从句吗？

问题 each 用法疑问

If we can find 5,000 people to each take one home, the problem will be solved.each后是不是省略了个to？可能是学生不怎么了解这个each的用法吧，麻烦老师讲讲

问题 as...as省略

老师好，有这么一个句子I should be as glad as to welcome + 人名译文是：我很乐意推荐...  请问这里是as…as结构，并且第二个as后面是省略了主谓吗？

问题 Indian and Pacific Oceans提到两个洋时，能不能用单数Ocean

...ea, a meaningful revival is unlikely when manufacturing and heavy industry are so much smaller than they were.谢谢老师！

问题 为什么不使用过去完成时

...“Sea ice is finally forming," one scientist reported. “The polar bears are moving quickly offshore." The Arctic- the polar bears' habitat- is changing. Temperatures have gone up about 3 degrees Celsius since 1900. The ice cover is becoming smaller, too.In 2019, it was 30 percent smaller than it ...

问题 the United Nations作主语谓语可以用复数吗

The United Nations 的意思是“联合国”，它是一个机构，所以作主语时谓语动词通常是单数的。比如：The United Nations is an international organization. 联合国是个国际性组织。The United Nations has issued a condemnation of the regime. 联合国发表声明谴...

问题 形容词和过去分词作形容词的区别

...e child is neither old enough nor clever enough to realize the desired action on his own, what possible gain is achieved by having him struggle? He may well get frustrated and angry — certainly not a desirable outcome. 请问专家老师们，desired 和desirable 作形容词，用法有何...