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问题 这个reason不可数吗

辅导书上有这样一个句子：For some reason the charcoal wasn’t catching.请问为什么reason没有用复数？reason在这里是不可数名词吗？句子意思如何理解？谢谢！

问题 过去完成时？

In England tea didn't appear until 1660, but in less 100 years he had become the national drink. 这里用了过去完成时had become， 过去完成时是过去的过去，这里had become是在强调发生在哪个过去动作之前的？谢谢，盼着专家老师解惑。

问题 be considered admitted 结构分析

If..., the allegation is considered admitted. 其中 admitted 是过去分词做主语补语吗？期待指教！

问题 祈使句可以做宾语从句吗

比如：Please be reminded (that) don't go to the basment.这个句子是否正确？

问题 句子成分分析

They think that this will lead the ancestors back to earth.划线这我把它认为     谓语+宾语+宾补但是还有人认为它是  back  to earth 看做状语，所以到底哪种是对的呢，谢谢!

问题 句子成分划分

老师好，请问句首的craft作何成分？Officially an experimental craft, testing new propulsion systems and imaging devices for spotting space debris, American scientists and military leaders have watched the sj-17 perform remarkable manoeuvres.

问题 星期前不加介词

请问一下，The 2019 World Artificial Intelligence Conference was held Thursday in Shanghai  这个句子中为什么Thursday前不加on，而被省略。   谢谢老师回答了。

问题 down是介词还是副词的区分

He rolled his suitcase down the hall. 这句话里面down是介词还是副词？

问题 副词是否能修饰be动词

where is the toilet.1.副词是否能单独的修饰be动词。2.where是疑问副词 ，在这句话中 where 是在修饰is么。

问题 不及物接同位语从句疑问

The story goes that William killed his wife. 为什么goes不及物可以接从句？

问题 从句的省略

This rule may have preserved the shark from being eaten as well as other animals ______.空格处答案给的是hunted. 省略了from being.我想问一下，这个省略是遵循了哪条规律呢？为什么可以省略，有没有什么推广性？

问题 谓语和非谓语的判定

The man looked at me, smiling and ____(say) “Thank you.”请问这个空填said还是saying，还是都可以?

问题 ten meters long用法

The classroom is ten meters long / ten-meter long.ten-meter long可以吗？如果不可以，错在哪里？

问题 over加数词用法

over加数词用法  over twenty people were seriously injured in the traffic accident over加数词时是介词吗 感觉加了数词是定语修饰prople 但介词短语做定语不是后置的吗

问题 where的相关疑惑

They’ve also found profitable markets for the recyclables where cast-off items are acceptable or even welcome. 老师，这里的where怎么理解，这里的where可以用and替代吗？