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问题 介词of和in怎么区分及怎么用

1.中国早期历史上：in the early history of China2.中国的独特元素：a unique element in Chinese culture为什么第二句不用of而用in?

问题 To know...requires knowing...句式理解

To know that an action is good requires knowing that refraining from performing it is bad.求这句话的翻译，特别是 it is bad 在句子中是什么成分，如何理解这种用法，谢谢！

问题 句子成分分析（主语与句子隔开）

With him was the son of captain of police, a boy of sixteen years of age，who had recently entere the army.这句的主语是a boy of sixteen years of age 吗？可以这么写吗？其中有什么语法知识，可以详细讲解一下吗？

问题 That would be telling

'Who are you going out with tonight?' ' That would be telling !' (= it's a secret) "你今晚要和谁约会？" "那可不能讲！"(是个秘密)为什么这个句子是不能说的意思？

问题 笔直向前走,该用straightly 还是 straight

如果我想表达"笔直向前走,笔直向上走" 这个"笔直" 是不是应该用straightly ,straight好像是"直接"的意思?副词up/ahead位置是否前后都可以? go up/ahead striahgtly? 或 go striaghtly up/ahead

问题 dispense为什么加with

I'm well enough to dispense with a nurse's service.1.dispense 在vi. vt. 中都有"免除"的意思, 那么为什么它需要with呢? 什么情况下"免除"不需要再加with?2.不定在这里是表示程度还示结果呢?

问题 Developed most probably as a ...分析

Developed most probably as a denfence against forest fires,the bark of the cork...请问老师，红色部分是做句子什么成分的？这是一个什么用法啊？请教教我, 谢谢!

问题 是形容词做定语还是过去分词

Now we know that what we see is mostly reflected light,like the light from the moon which is reflected sunlight. 这句话中出现的两个reflected，是形容词做定语呢?还是过去分词，构成被动be done呢?

问题 cognitive decline和cognition decline

...定搭配所以通常采用第一种说法呢？ 有人说用cognition的话用decline of cognition比较恰当，但是这样子表达的话中心词不是变成decline了吗？

问题 come out/come out of

Are you sure that they didn't come out the mouth of the tunnel? asked Job Titus.这里的come out后面是不是应该有个of?请老师们帮我分析一下，多谢。

问题 翻译疑问(compared favorably with)

DNT(do not track) does not seem an obviously huge selling point for windows-8 though the firm has compared some of its other products favorably with Google's on that count before. 此处的compared favorably with该如何理解 如何翻译？

问题 否定词后用and还是or

外研版七年级上册英语课文中有这么一个句子：I go to school on weekdays, but not on Saturday and Sunday.对该句我有两个疑问：一是and应该改为or吗？二是这里的Saturday和Sunday应不应该使用复数？

问题 come prepared 和 left undone 理解困惑

I'll come prepared.Most of the work had been left undone.以上动词后面出现的如prepared, undone，是非谓语过去分词还是形容词？这是什么用法呢？

问题 请教一句英文表达

...w I could stop it.想请教老师，她掉头发是一个过去时间发生的动作，为什么这里不说 why I lost my hair呢？或者说是不是这两种表达都可以？请讲讲原因

问题 为什么这里are后面可以加a

Thrushes are a protected species so you will not find them on any menu.为什么are后面是接a的？为什么thrushes后面对应a？