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问题 All debilitating, to be sure. But probably not fatal.是什么结构

...附上整段原文：All debilitating, to be sure. But probably not fatal. The firm remains the world’s second-biggest aluminium-extruder with a vast home market. Disclosure delays are common in Hong Kong and may be unrelated to the DoJ case. And China’s government, itself in a tussle with Ameri...

问题 介词Before 句型中的时态理解

1.  We managed to arrive at the hall before the concert had started.2.  He came in before I had done half the work.  请教老师，我们都知道发生在 “过去的过去” 的动作用过去完成时态，可是句中介词before前的动作先发生用过去时态；before后...

问题 lay的过去式和定从句引导词

...都没有停止他的忏悔。译文：He didn't cease his penitence until the day that he laid in the cemetery.问：该句是不是laid应改成lay,laid是lay“放置、产卵”的过去式和过去分词，再that 是不是该改为when作定语从句 he laid in the cemetery的时间状语？

问题 这里使用介词by和in, 含义的理解究竟有什么不同

By the 1950s, a movement in the United States to combat discrimination was growing:the civil rights movement.这里用了介词by, 和如果使用介词in, 含义的理解究竟有什么不同？

问题 it跟them的用法如何区分

I think the most useful technologies are computers and the Internet, which can make our learning more efficient and we all benefit from it.想请问老师这句话里面 we all benefit from it  的it 应该是代指 computers and the Internet 这样应该是双数，为什么不用these或者them...

问题 几个经济学人文章的问题（请曹老师解答)

...ed three years ago to much fanfare about being a transformative moment for the health-care industry, Amazon,JPMorgan Chase and Berkshire Hathaway quietly shelved Haven, a joint venture they set up to lower staff health-care costs. 这里很明显announced部分的主语不是Amazon, Jpmorgan等公...

问题 非限制性定语从句中which指代前面的事情

...面我写的两个句子是否有问题？Nowadays, an increasing number of people are learning online, which has both advantages and disadvantages.这个句子想表达在网上学习这件事有好有坏（而不是越来越多的人采用这种方式有好有坏），那么which指代的就不是...

问题 如何简单明白地理解：定冠词和不定冠词

...什么用法中，它们的根源含义是泛指和特指，也就是说和the连用是特指的含义，和a连用是泛指的含义。在说明白点就是定冠词the各种用法中均有特指含义，不定冠词a在各种用法均有泛指的含义。（a和the的固定搭配除外）可以这...

问题 时态问题

1) I didn't think I'd like the movie, but actually it is (was) pretty good.这里用is还是was, 前面部分是过去时态，如果用现在时态is表达这个电影本身很好的事实是否可以？2) I came (was coming) to visit you later that day, but I had to phone and cancel.had to pho...

问题 非限制性定语从句还是地点状语从句

...？先行词是homes，还是systems？谢谢Travelling around Thailand in the 1990s, William Janssen was impressed with the basic rooftop solar heating systems that were on many homes, where energy from the sun was absorbed by a plate and then used to heat water for domestic use. 

问题 定语从句中什么情况下不能将介词置于句末

语法书上讲到：1.The farmer used wood to build a house which to store grains in.—该句错误2.We moved to the country so that the kids would have a garden which they could play in.—该句正确什么情况下介词可以置于句末？什么情况下不可以？

问题 play that + 一个句子: 这是什么结构和用法

...on a tripod, playing that it was a camera, and halted all passers andaimed the thing and said "Ready! now look pleasant, please," but not even this capital joke could surprise the dreary faces into anysoftening.有2点疑问：1）playing that it was a camera - 拿着这个当照相机玩...

问题 这个句子中的using which是什么用法？十分不解

The specimen is loaded by a SHPB system,using which static tensile load is appiled to the specimen and maintained before applying the dynamic load.大概意思是：试样被SHPB系统加载，直到在施加动态荷载前，静态荷载首先被施加在试样上并一直维持此状态。

问题 请教关于with的用法

1. Even though the road was littered with boulders and pitted with holes, Bruce was not in the least perturbed.2.There was a strong wind，and the two men's faces were white with snow．请问这里的三个with 意义是  “伴随”  还是  ”因为 由于"   ...

问题 like用作介词时，后面可以加状语从句吗

具体语境为：Like when you lay your baby on their back and you pull them by the arms gently into a seated position, the baby’s head may nod back behind the shoulders, like poor head control.请问句中的第一个like后面可以加状语从句吗？另外，第二个like前面的逗号是...