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问题 这个witness为什么不用冠词或复数

见到这样一个句子：Police have appealed for witness to come forward. 警方呼吁目击者挺身而出。请问这个句子中的 witness 前为什么不用冠词？或者将 witness 用复数？

问题 难句句子结构分析

As a result,the support for ambition as a healthy impulse,a quality to be admired and cultivated in the young,is probably lower than it has ever been in the United States.这个难句的主语是什么？我知道谓语是 is probably 这部分，求讲解!

问题 as表示“……之后”的意思

He expects the system to get even better as the engineers tweak its performance. 他预计在工程师对其性能稍加改进后，该系统会运行得更加良好。这句话中as被翻译为“......之后”，但是词典上并没有这样的用法，而只有as of才表示“......”...

问题 would be的用法

...好，今天学习的时候遇到的一个句子是这样的：Another way to stop this law would be for the Supreme Court.是讲到美国的三权分立的时候，说道最高法有权驳回国会通过的不合宪法案。不明白这里为什么用了would be。感觉最高法有权驳回不合...

问题 of和从句连用时的疑问

请问老师： There was problem after problem to overcome, not least of which was that their store of Polyjuice Potion was greatly depleted.这句话结构是什么？后半句加粗部分是什么从句？句中of起什么作用？

问题 before可用作关系副词引导定语从句吗

It was the Friday before he came to see me.这个 before 引导的是定语从句吗？如果不是，它是什么从句？如果是，那 before 引导定语从句有什么规律？

问题 不定式的逻辑主语可以直接用主格吗

I to do it is out of the question. 我做那件事是不可能的. 请问这句话符合正规语法吗？

问题 前半句虚拟后半句陈述

If you decided for a surgery, another important factor to consider is the choice of the surgeon. 请教老师，为何用decided 而不用decide ? 再说，后半句是陈述句，为何不前后一致呢？

问题 情态动词can,should

Sometimes I am not as brave as I ___ be. So I'd rather keep silent to avoid hurting myself.A should  B may  C can  D must专家老师，我觉得这里至少AC（should,can ）都可以，您怎么看这道题呢？

问题 Indicative of 的用法

...ndicative of the increased resistance offered by the flocculated structure to the compaction effort.请问这个句子中，indicative of 是什么用法啊？怎么直接接在一个完整的句子后面了？

问题 though comfortable 是什么结构

On such a snowy day, I would go to work by bus rather than by driving my car, which, though comfortable, is more dangerous, — especially given my poor skills in driving.请问： though comfortable 是什么结构？ given在这里是什么意思？

问题 现在完成时的用法疑问

这句话中为什么要用现在完成时，还有in exchange for 当什么成分，求指教！ I’ve offered to do the job in exchange for a week’s accommodation.

问题 on做表语的用法

在看美剧时经常看到on做表语的用法，特别时子女不满父母的时候说的。例如："why are you on me about everything?", "Why is everybody on me?","Do you have to be on all the time?"请问这里的on是什么意思？

问题 would rather和had rather的区别

请问贺老师，had rather 是什么意思，怎么用？They had rather go to the movies.would rather和had rather的区别?

问题 定从和同位语从句区分

Skills have to be paid for in the same way that goods are paid for at a shop. 请问这句话是定语从句还是同位语从句，网络上说这里that可以改成in which，这要怎么理解？