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问题 did sightseeing是什么用法

Kristin Diehl conducted a series of experiments on photo-taking to find out whether people enjoyed it when they did sightseeing.过去式did后面为什么用ing形式（有did doing句型吗）？

问题 since引导时间状语从句

...直在干嘛。而不能用于“已完成的影响用法”，He’s put on a lot of weight since he gave up smoking. 他戒烟后体重增加了许多。　　

问题 句子成分分析

I wish to die while still at work,knowing that others will carry on what I can no longer do, and content in the thought that what was possible has been done.这里content可以和knowing并列嘛？content是形容词。后面那个that what...又是什么结构？还请老师们指教！

问题 Take在比较中的用法

原句：Mars takes longer to revolve on its axis than the earth.翻译：火星自转一周的时间比地球长。按理来说句子主语应该是'火星'，而不是‘时间’.我先请问大家这是什么用法？

问题 for的含义理解

This building is a glorified incubator for every infection on the plant.这本句出的翻译是“这栋建筑是美化后的用来隔离地球上各种感染的恒温箱”，但原英文并没有表示隔离意义的单词，为什么会有“用来隔离”这几个字呢？难道这是因为for...

问题 关于up的疑问

...里摘抄的一句话，请看：For more than 10 years, suicide rates among students aged 10 and up in the U.S. have been on the rise. 10多年来，美国10岁及以上学生的自杀率一直在上升。请问这里的up是什么词性？省略了什么成份？谢谢老师！

问题 句子结构

So can the movements of aphids when, having depleted the young leaves on one food plant, their offspring then fly onward to a different host plant, with no one aphid ever returning to where it started.这句话前面是根据上文省略了动词并且倒装了吗，后面when这里为什么有逗...

问题 mirror用法

"The regression of braincase sinuses in thallattosuchians mirrors that of cetaceans, reducing during their semi-aquatic phases and then diminishing further as they became fully aquatic," Mark Young, the paper's lead author said in a statement on Wednesday.这句话的mirror是不是和什么一样...

问题 英语长难句分析(涉及定语从句与先行词的修饰关系分析)

From the Ivy League to the great public universities of the South and Midwest, student demonstrators have called for the renaming of buildings and academic departments, the removal of artworks and even the scrapping of sports team mascots that celebrate controversial aspects of history.请问...

问题 it is adj of sb to do sth 中的wrong的问题

沪教版的八年级下册中出现了It's wrong for us to buy products made from endangered animals. 又出现了，It is wrong of you to do sth，到底那个对，of不是表示人的特点的词吗?请老师指教，老师教的是 It's wrong of sb to do sth.

问题 名词问题

...bile phone. when I woke up at midnight, I did the same thing. Keeping away from my phone for forty eight hours changed my way of life. I fell asleep listening to the songs of frogs and insects.第1,2,3句话中的标红字体是什么意思啊。在句子中做什么成分？第4句话中Thing为什...

问题 如何理解no stranger than = 应该是等于as familiar as的意思吗？

But how strange it was that the creative instinct should seize upon this dull stockbroker, to his own ruin, perhaps, and to the misfortune of such as were dependent on him; and yet no stranger than the way in which the spirit of God has seized men, powerful and rich, pursuing them with stubborn vigi...

问题 if 条件句的理解与翻译

If I can stand back up, the race goes on. 请问这句话是 if 引导的条件句吗？另外 stand back up 怎么翻译呢？

问题 that在句中是什么语法成分

A force that strong had tremendous effects on the area around the volcano. 问题：请问that strong是什么语法成分？定语从句还是插入语？

问题 情态动词must

1， You（ must have been/ Must be） a good student when you were at school. 2， Last night I saw a boy wandering on the street.  He must （have been /be）lost, I thought to myself.请问这两据分别选哪一个？如果不一样的话，为什么不一样？