My sister_________(stayed) in Beijing for three months last year.答案是stayed，不能理解。 虽然句子中有last year, 但for three months不是表示一段时间吗？一段时间不应该用完成时吗？既然在过去发生是否能用had stayed或had been staying? 还请老师帮忙...
Last month, after analyzing figures on epidemics since 1960, The Economist concluded that people die at a higher rate from such disease outbreaks in authoritarian countries than in democratic ones, even controlling for income levels.请问control for在这里是什么意思？
...d which was her seat.或：She wondered which her seat
was.同理，Who is your roommate?在间接引语中也可以是 You want to know
who my roommate is. (UUEG)因此，《英语惯用法词典》的说法与现代英语的实际使用情况不相符，国内持有相同观点的其他一些著...
Mother had led me to believe the new baby was a kind of present for me.Shawn was just dropping off a pair of new sneakers.I picked up a piece of wood and started carving. 请问老师：a pair of/a kind of/a piece of到底是什么成分？我搜了搜其它的帖子有的把它们称为限定...
1. go on a trip是看做一个整体的词组，还是把go on看成短语动词跟宾语 a trip，还是 go后面跟一个介词短语on a trip作状语?2. go on a trip to、go for a trip to和be on a trip to的区别是什么？我是英语小白，请教各位老师了!!!
...e
morning, I was waiting at the bus stop, worried about ___41___ (be) late for
school. There were many people waiting at the bus stop, ___42___ some of
them looked very anxious and ___43___ (disappoint). When the bus finally
came, we all hurried on board. I got a place next ___44___ the window, so...
He turns away, as if finally realising that the faceless, flickering icons on his computer screen will not give him what he longs for.as if引导的方式状语从句这里是将he realises变成了realise再加的宾语从句（that…longs for）吗？
The use of knee braces is quite a vital consideration for different injuries which may be intended for prevention as well as the incorporation of a comprehensive treatment plan.请问老师：which定语从句是修饰什么呢？修饰The use of knee braces吗？这是分隔式定语从句吗，...
...be the cause of something)是某事物的根本原因,例句：1)Allergies are at the root of a lot of health problems. 过敏是许多健康问题的根源。2)The love of money is the root of all evil . 贪财是万恶之源。为什么句1）are at the root...有at， 而句2）却没有了at, ...
...很可怕的经历。Being recognized wherever you go is the price you pay for being famous. 出名所付出的代价是不管你走到哪里，都会被人认出来。(2) 作宾语。如：He can't stand being kept waiting. 让他等着，他可不干。Do you like being stared at? 你愿意人...
If we give up the idea that higher levels are literally constructed out of lower level elements, as I think we must, then it becomes much more natural to consider even such abstract systems of representation as transformational structure (where each utterance is represented by the seq...