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问题 must have been与was的区别

It must have been a gas that could burn but that would not explode, a gas that did not smell strong, and a gas that did not kill people.1)不用must have been, 改成was， 则2句理解上有何不同呢？2）这是定语从句，句中第一个that能理解，后面but that如何分析成分呢...

问题 关于-ing分词分句与限定从属分句的转换关系的疑问？

...he hall is/was my cousin.=who is /was singing=who has/had sung=who has/had been singing可以改成=who sang (一般过去时）吗？即The girl who sang in the hall is/was my cousin ?2)I feel it to be a rare occasion, occurring as it does only once in many years.= since it occurs原句occurring as...

问题 as引导的定语从句还是方式状语从句

...在完成时，并且说成了come to know的形式，而不是as it has been known for some time 呢？   come to know 和 get to know 和 know 有什么区别呢？谢谢老师！

问题 宾语从句中had been和was不同时态的含义辨析

...句仍然使用了it was一般过去时呢？We had all heard that it HAD BEEN a great dam - 可以这样说嘛？这里的宾语从句用was和had been语义上有何不同呢？

问题 have been for six months是什么意思

请问下面一句中的 has been for over six months 是什么意思：He’s unemployed at the moment and has been for over six months. 

问题 请分析 not having + v-ed

Not having obtained a ticket for the match, I can only watch it on TV.这个Not having obtained是什么用法？啥意思？是哪句话的简写吗？属于什么语法呢？not后面加名词词性的词语对吗？所以having obtained是名词词性吗

问题 主语下加状语和评注性状语的判断

...dverbial,functioning as a sentence adjunct with [2] where the function has been narrowed to subjunct status:Leslie greeted the stranger casually. ('in a casual offhand manner', his greeting was casual) [1]Casually, Leslie greeted the stranger.('Leslie was casual, offhand, when she greeted the strang...

问题 现在进行时与现在完成进行时在用法的区别

...nbsp; (sit) on the table the whole time in plain sight.空格处填的 has been sitting, 我想问的是能不能填 is sitting 呢？

问题 have never been more necessary是什么意思

A COLLEGE degree has never been more necessary: graduates earn, on average, 80% more than high-school graduates.请问：has never been more necessary 是什么意思？

问题 that quickly 是什么用法

... or five years if officials decide to spend it that quickly. It would have been better to increase the regular defence budget, rather than relying on a one-off top-up fund, so that the change would be harder to reverse. But still, Germany will for now become the world’s third-biggest military spen...

问题 句子解析

...hter' except to order her to keep her now that she was old just as she had been kept when she was young, this wretched creature was called Louise and, in obedience to her mother, she sold herself without inclination or passion or pleasure, rather as she might have followed an honest trade had it eve...

文章 可以后跟v-ing形式的动词（短语）(七) ——以《朗文当代高级英语辞典》（第6版）为蓝本

...ing/wondering etc something 例如：I can’t help feeling that there has been a mistake.我总觉得什么地方出了错。I couldn’t help thinking about the past. 我不禁会想起过去。122. hit back (P1232) 作“to attack or criticize a person or group that has attacked or criticized you...

问题 Probably for as long as there have been sales forces,managers have sought ways to determine whether they are effective or not.

请问这句话里面的 for as long as 是什么意思  和 as long as 是一样的意思吗

问题 as引导的是什么从句

Didi has been engaged in an all-out war against Uber in China. The Chinese company has long claimed the upper hand, as it was operating well before Uber got into China.请问句中的 as 是什么意思？它引导的是什么从句?

问题 “have been+形容词”可与次数连用吗

▲我知道，“have been to + 地方”是可以连用次数的。如：I have been to the farm three times. 我去过这个农场三次。▲类似地，have been here (there) 也可以连用次数。如：We have been there three times. 我们去过那儿三次。▲我这里的问题是：have...