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问题 by在这句话里是什么意思

China may shorten the time to catch up with Western countries in this field by several decades.这里by怎么理解呢?

问题 either是表示两者中“一个”还是“两个”

老师说,either 用于表示两者中“一个”,但感觉有时它是表示“两个”啊!比如:There are trees on either side of the road. 这不是指路“两边”都有树吗?难道只有一边有树?

问题 as后面加ing结构

...ne another, high levels of intelligence, both individual and social. 亲爱老师好,这个句子as后面这一些如何划分成分,是什么意思啊?as后面可以直接加ing吗?

问题 as far back as 什么意思

The history of roast duck can go as far back as the Southern and Northern Dynasty.这里go as far back as怎么理解呢,前者和后者一样?

问题 what作主语时谓语动词用单数还是复数

比如下面这句:What lives longer than human beings?按理说,比人类活得久肯定有不少吧?为什么动词用单数呢?可以用复数吗?

问题 a large part of…可以省略冠词吗

(A) Large part of our income goes on animal feed.上面句子中不定冠词可以省略吗?

问题 我们为何叫“不定式”为“不定式”

我们为何叫“不定式”为“不定式”?是因为“不定式”是由原形动词前面附加了一个“小品词” to 而构成吗?还是因为其它原因?  

问题 节日前面用介词at有哪些

表示在某节日,通常是用 on ,如 on Easter Day, on Christmas Day 等。但有些也用 at,指节期,如 at Easter, at Christmas 等。请问一下:像 at Easter, at Christmas 这样可以用介词 at 还有哪些?

问题 convinced后面要接虚拟语气吗

convinced 后面要接虚拟语气吗?His father, a retired officer, was convinced that he needed to go to a school that challenged him.这句话中 convinced 是不是接了一个虚拟语气句子?

问题 形容词作宾补还是作后置定语​

A series of improvements produced an instrument capable of myriad tonal effects.请教一下各位老师,1.“capable of myriad tonal effects”是作补语还是后置定语? 2. 能不能麻烦补充一下后接形容词作补语动词?谢谢。

问题 表语指物时为什么能用人称作主语

Was I to be the cause of her death too?老师,为什么表语可以是有生命东西?

问题 none of which...用法分析

We tested all these boats, none of which are intact. 这里none of which. None是不定代词,of which作定语修饰none,如果这样理解话,句子里面就是noun作主语,没有连词,这该如何理解?是把noun of理解成限定词吗?

问题 表示“快到一个地方”是用near还是nearly

请问,在表示我们快到那了, 是 We are near there. 还是 We are nearly there. 两种写法都看到过,也不知道哪种才是正确...

问题 some information about the proposal怎么翻译

Some information about the proposal has been sent out.这里 proposal 是“提议”还是“求婚”?send out 怎么翻译?

问题 after being submerged 是被动表示主动吗

She was taken to  the hospital after being submerged in a river.这里after being submerged是被动表示主动吗?该怎么理解?