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问题 that可以代替it作形式主语吗

That isn’t anything for us to be ashamed of.这里的句子为什么用 that 作主语，而不用 it 呢？难道 that 也可以作形式主语吗？

问题 and是表示转折还是对照

Both Brazil and China do rely on each other for a lot. And as Europe slows as we’ve been talking about and U.S. does remain sluggish.句中两个and是表示转折，还是对照？如何理解这两个and在句中的用法？

问题 关于静态动词完成时的问题

静态动词完成时表示持续一段时间一般用for/since那么so far/before/this year/always/recently/today/never/ever表示从过去持续到现在的时间状语也可以用于静态动词完成时吗，能不能各个分析一下并给些例句，谢谢！

问题 so that前后时态要一致吗

(学校老师出的，不知道是否有误)His love for mountain climbing is so great that he kept on climbing mountains even after this experience. so that前后时态要一致吗？

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 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 句中的a clip of如何理解

That Catholics voted for Obama at a clip of about 60% in 2008 is interesting.请问这里的 a clip of 如何理解？其中的一部分吗？

问题 it 与 itself 的用法区别难点

请问下面句子应填 it 还是填 itself，为什么？To my surprise, Mary’s beautiful hair reached below her knees and made______ almost an overcoat for her.

问题 能说 thank sb to do sth 吗

常看到 thank sb for doing sth，请问能说 thank sb to do sth 吗？

问题 如何区分一般将来时和将来完成时

By 2020，scientists surely _________ a cure for AIDS.A.will discoverB.will be discoveringC.must discoverD.will have discovered

问题 enough...to...这种属于哪一类不定式

enough...to...这种属于哪一类不定式? 如：Is there enough lunch for everyone to have a picnic together ? 

问题 invest的用法问题(as invested...)

Sherman upends images of wealthy people as invested only in accruing and displaying social advantages for themselves and their children. 请问老师，as invested...的invest应该用什么意思呢？

问题 when引导时间状语修饰主句的哪个动词

He sent them out to ask for help when in trouble.这里的 when 从句是修饰 ask 还是 sent 呢？感觉离 ask 更近，应该是修饰 ask 嘛？

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 句子中的动词be可以省略吗

With so many companies competing for consumers' attention, price competition was intense and profit margins thin or nonexistent.profit margins 后面是否省略了were？