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有关完成时态的若干疑问（涉及事件、习惯等）

尊敬的您好，请问：

half与不定冠词

知道half与the连用时of可以省略，比如：half (of )the students, 那么，half与a ,an连用时有没有of的？half of a watermelon对吗？谢谢！如题

英语可说in bed，但可说on bed吗？

英语可以说in bed，但可以说on bed吗？比如以下各句中的in bed可以换成on bed吗？He lay in bed, awake. 他躺在床上，没有睡着。Stay in bed for a couple of days. 卧床休息几天。I was in bed with flu for ten da...

let alone 与 letting alone

I hardly had time to think these days, let alone relax.为什么不能用letting alone作伴随状语?如题

in the need to do sth 的理解

These firms have been given a tough lesson in the need to diversify their markets.请问红色部分怎么理解？如题

如何怎么翻译: surviving version

Shu苏震东’s model is now the only surviving version of Zhou（周厚坤）’soriginal invention.

since的怎么翻译

请问！汉译英：自从我独居，便不时感到孤单。I feel lonely from time to time since Ive lived here.这个怎么翻译是否正确？如题

That’s why.../ That’s because...等的区别

I had neither a raincoat nor an umbrella. _______ I got wet through. A．It’s the reason B．That’s why C．There’s why D．That’s because 答案是B。但我想知道A为什么不可以？it’sthe reason省略了关系副词why...

现在完成时中的have been to疑问

有些琢磨不透have been to是怎么一个原理结构？是不是have done+be to=have been to？be to的意思是 将要做，然后加上完成时的形式后 have been to，表示已经做过？包含着一种 非延续性的含义在其中 对吗？然后如果h...

too early还是too soon

It is _________ to say what effect, if any, there will be on the workforce. A. too early B. too fast C. too quick D. too soon 请问选哪个最好？书上给的答案是A。但是觉得D也可以。请问在这里too early与to...

表语从句的疑问与修改

Bullying is when someone makes you feel bad or hurts you again and again.

according as后接什么样的从句？

according as后接什么样的从句？可以接what引导的从句吗？若不能，是不是该用according to呢？如题

为什么柯林斯把这个例子叫做现在分词而不是动名词

PREP You use of to combine two nouns, or a noun and a present participle, when the second noun or present participle defines or gives more information about the first noun. 用以连接2个名词或1个名词和1...

may want什么意思？

After students have completed activity 2b, the teacher may want to conduct a post-listening discussion.这里的may want什么意思？may在这儿什么用法？如题

(情态助动词)will have done这个将来完成时为什么不表示对将来的事件推测

原文：对过去情况进行推测，情态动词+have done; 对现在的事件进行推测：He must/will/would/should/could/may/might/cant have left yesterday.如题

如何理解这里的stamped

Before deciding to spread God’s word in China, Sheffield had fought in the U.S. Civil War. He was fearless and determined. Even after surviving an apparently random attack from a mad Chinese carpenter...