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问题 before 连接的句子主句何时用过去完成时新概念三第6课习题

He_______the display for several minutes before re-entering his shop.A. was gazing at   B.gazed at C.had gazed at   D. had been gazing at这个题目答案是B，想知道为什么不能用过去完成时或者过去完成进行时

问题 harmful是由动词harm还是由名词harm加后缀-ful变来的

I told him how ___61___ (harm) plastic could be to the environment and asked him to consider using more eco-friendly options.这是2021新全国卷2的语法填空题，答案填 harmful。请问这里的 harmful 是由动词 harm 还是由名词 harm 加后缀-ful变来的？

问题 对2014高考句子的质疑：wave his arm还是wave his

...的句子出自2014年高考英语的新课标II卷：He was riding beside the bus and waving his arms.我对句中的waving his arms表示怀疑，我觉得句中的arms应用单数，因为从安全角度看，一个人一边骑车一边挥手，应该是只能挥一只手，不可能挥两只手...

问题 考题中regret to do与regret doing的区别

The boss told them some things he later regretted ______. A. telling    B. to tell     C. being told      D. having been told请问这是考查 regret 后接不定式 to do 和动名词 doing 的区别吗？在这道考题中如何区...

问题 It is strange that…中的主语从句必须要用虚拟语气吗

It is strange that the boy should have said that to his mother. 真奇怪，这男孩竟会对他母亲说出这样的话来。这里的 It is strange that…中的主语从句用的虚拟语气，这是必须的吗？可以不用虚拟语气吗？或者说：不用虚拟语气算错吗？

问题 those who…中的定语从句可以换成现在分词吗

.... 想要走的人现在可以轻轻地离去。Will those who want to join the club please sign here? 要参加俱乐部的人请在这里签名。以上各句中的 who 是引导定语从句，请问这些定语从句可以换成非谓语动词吗？我重点是想了解，those 后面可以接现...

问题 have an aversion to do还是have an aversion to doing

She has a deep aversion to _______(get) up in the morning. 如何填？是填动词原形 get 还是填动名词 getting？

问题 arrive in+大地方；arrive at+小地方；那么arrive on+什么地方

介词的用法很灵活，是不是记住常用的就可以了？Three years later 117 men, women and children arrived on Roanoke Island,in the Virginia colony.老师，arrive in+大地方；arrive at+小地方；那么arrive on+什么地方?

问题 services with one another中的with该如何理解

...句子（摘自考研1999年英语一某篇文章）：More recently, as the Web proved to be more than a fashion, companies have started to buy and sell products and services with one another.【参考译文】最近，由于网络不只是一种时尚，公司间已经开始在网上互相交易...

问题 be going to与be going to be的区别

He says he's going________ a computer programmer in the future.a.to do b.become c.be  d.to be这个答案选择d，老师我想问下：to后面为什么还要加一个be动词。谢谢！这个be 动词在什么情况下要加！

问题 by reducing decisionmaking to one man’s whim,中to o

Some think that by reducing decisionmaking to one man’s whim, he has left the Saudi monarchy only a bullet away from collapse.

问题 Would have done结构的用法

...思一样吗？3, 章振邦，新编高级英语语法195页If I had won the lottery, I would have bought a yacht next year.请问里面完成体（Would have bought.）换成不定式的一般体Would buy可以吗？含义有没有差别？

问题 过去分词done与现在分词的被动完成式having been done有何区别

非谓语动词中，过去分词done与现在分词的被动完成式having been done有何区别？例如这句话中： Heated, the metal expands. 能不能说having been heated 不是都表先后发生，且是被动吗？

问题 句式分析

...看到一句话：What would help me even more is if you worte a letter to the parole board telling them i have changed.这句话是不是不太对：1)表语从句不能用if引导，这里怎么出现了if？2)worte用了过去式代表的是虚拟语气吗？但表语从句的虚拟语气其主...

问题 count on sb doing怎么分析成分？

You have to count on the ordering physician seeing it while you move on to something else.你需要依靠开处方药的医生在你忙其他事时帮你盯着点。We can't count on this warm weather lasting.我们不能指望这暖和的天气会持久。我的问题是：count on是依赖的...