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问题 as,when,while的比较

...It's obvious that she lacked self-confidence. A. when B. while C.if D. as老师，这题选A，是表示在他本应该继续的时候吗？ 但是B和D不是可以表示在什么时候？还是这里的when 有什么特殊的用法。求教老师。

问题 be key to doing sth的用法疑问

中英的政府工作报告里有一句:Reform is key to modernizing agriculture.想问一下这里为什么是ing。动名词？还是to做介词？还是神马？求解答，谢谢！

问题 为什么whether可以引导同位语从句而if 不能

I have small doubt whether he is suitable for the job.He hasn't made the decision whether he will go there.为什么在同位语从句中，whether可以引导同位语，而if 不能引导同位语？

问题 现在分词短语表示原因时可位于句末吗

...于身体虚弱而不能行动。 Being so ill, she can’t go back to work yet. 由于病得那么厉害，她还不能去上班。 The teacher, not having heard the chimes, kept on teaching. 老师没听到下课铃声，仍继续上课。 Not knowing their language, he found it hard to ...

问题 怎样理解：earthworms gain 14% less body weight when operating under rubber

But now britons have fallen in love with artificial grass.Evergreen UK,which sells the stuff,says it has seen a 120% rise in sales since 2015. Artificial grass is popular with families who have children or dogs and don’t want mud dragged through their houses. It has another charming factor,too - p...

问题 but useful also是什么用法(表强调吗)

Perhaps all the deficiencies have since been rectified. It seems to me there are many things (often more a matter of attitude and perception than the simple memorization of facts) that the schools should teach — things that truly would be useful in later life, useful in making a stronger country a...

问题 added to是什么用法

With research going on all the time, there would be greater wonders added to those it has already brought us.added to是什么用法？可以adding to吗？不理解。另外可以用will be 代替would be吗？ 有区别吗？麻烦老师详解，谢谢！

问题 强调结构(what it was that was wrong with...)

...the prospect of a perpetual uncertainty about everthing in life, from food to clothes to education. I knew that the life I was living couldn't ba normal. I just wasn't sure   what   it was that was wrong with the tiny microcosm I was born into.  为什么空格部分...

问题 不定式作宾语的问题（plead to do sth）

I pleaded to be allowed to go. I pleaded to be allowed to see his mother one more time.张道真语法书上注明，“不定式可以充当部分及物动词的宾语，也可以充当but, except等介词的宾语以及形容词的宾语。”可是plead意为恳求的时候并不是及物动...

问题 句子成分

I would like to thank you for arranging to meet with me for an interview.请老师帮我分析一下句子成分，for an interview是宾补吗？

文章 关于对好题分享(41)比较从句中what 用法的分析

...，what应该保留，这是因为动名词短语assigning these rankings to various usages的语义决定的，what 仅指代了主语的一部分rankings. 现在我们忽略这个语义，把句子主语再改一下：These rankings are much more helpful than what one finds in existing usage guide...

问题 什么情况下必须使用形式主语it

...况下，用形式主语it和不形式主语it都是可以的。如：1. To go out at night is dangerous.= It is dangerous to go out at night.2. Where he lives is unknown.= It is unknown where he lives.请问一下，在哪些情况下，我们必须使用形式主语it，而不能在句首使用真...

问题 为什么before前后时态一致(有什么规律吗)

It is not long before they are so accustomed to swimming that they can pick up weights from the floor of the pool.为什么这个before前后时态一致？有什么规律吗?

问题 what做从句的主语的问题

老师好，麻烦您帮我解答一个问题。谢谢“what is crucial to a successful classroom is to involve students.”the professor said.（be crucial to）“一个成功课堂的关键是让学生参与进来。”那位教授说1．划线部分为什么使用what做主语2．what is crucia...

问题 条件句

...从句使用一般现在时，这样的句子属于哪一类条件句？1 If you lose weight, you must eat less meat.2 Market your product if you want your product to be successful.