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问题 but用于句首的词性和用法

But after trudging for more than six hours through rivers,they reach the first gold mining camp. 这里的but是什么词性？什么用法？

问题 In previous literature这个介词短语的疑问

在一些文献里看到这个句子，为什么In previous literature这个介词短语的previous前没有jia冠词，literature也没有加s呢

问题 free table是免费的位子还是空位子

I’m afraid we don’t have any free tables this evening.free table是免费的位子还是空位子?

问题 for的用法

...on working well into what was once thought to be old age.是做什么成分的？谢谢老师。At 83, he also epitomises a striking demographic trend: for highly skilled people to go on working well into what was once thought to be old age.

问题 现在进行时与have的问题

What       you          (have) for dinner now? 这道题的答案应该是什么？是现在进行时还是一般现在时呢？  

问题 单词在句中的成分

Now the nation’s top patent court appears completely ready to scale back on business-method patents, which have been controversial ever since they were first authorized 10 years ago.请问主句的谓语动词是appear还是ready to 呢?

问题 主句主语作不定式的逻辑宾语

That question is difficult to answer.The car is too expensive to buy.若不定式的逻辑宾语是主句主语或宾语，不定式后是否可以省略？譬如buy和answer后面不用加宾语。

问题 being在句中的用法

请教曹老师：Ok, hi everyone. I’ll make this brief, because I have another meeting to get to, but what I have to say is no less important for being short.如果去掉动名词being，这个句子有什么不妥的地方？

问题 这个句子的in the box作什么成分

Here are two pens in the box.这里的in the box做什么成分？

问题 if not before的含义

Everyone knew it was the most expensive, the most famous of schools. You had to be entered at birth, if not before.请问老师：怎样理解if not before在上面句子中的用法和含义。谢谢老师！

问题 句意分析

...“运动让我精力充沛”。这两种含义我认为是有很大区别的，第一个是因为其他原因，比如喝了能量饮料，所以“精力充沛地去运动”。在第二个含义中用不定式表原因，所以是“运动让我精力充沛”。一个母语者告诉我是第一...

问题 a well-read person的理解（过去分词表主动）

...has learned a lot from them.这个句子是对柯林斯词典对 well-read 的解释。感觉这个 well-read 是表示主动意义，而不是被动意义，与下面的用法不同（下面的过去分词均表示“被动”意义）：This is a well-written and readable introduction to the subje...

问题 small的用法

Small wonder some executive may wish to preserve them after the pandemic passes. 这里small wonder什么用法

问题 twofold的使用

想请教一下老师，The reasons for my resignation are twofold 还是 The reason for my resignation is twofold?

问题 None的用法

How many people are there in the swimming pool?回答是There is none 还是There are none?