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问题 如何判断是分词还是动词(worked)

在牛津词典上看到shift有如下解释：a peroid of time worked by a group workers who start work as another group finishes.请问老师，如何判断 worked 是过去分词还是动词？

问题 被动句不跟宾语吗？

He was left a large sum of money in his uncle's will.如果被动句都不跟宾补，那这“ a large sum of money in his uncle's will" 是句子的什么？

问题 时间状语从句

___ , a small advertisement held my attention, which read 'Easy job. Good wages. No experience necessary.'A. Looking through the newspaper    B. While I was looking through the newspaperC. To look through the newspaper     D. I was looking through the newspaper.这...

问题 its指代谁

The exhibition, which opened this month at the National Museum of African American History & Culture, begins in a war-ravaged plantation house and ends with Georgetown University’s recent announcement of a bursary for the descendants of 272 slaves sold to cover its debts.谢谢老师！

问题 树上长叶子用什么介词

老师说：表示树上有果实，一般用介词 on；表示树上有鸟、虫、动物等，一般用介词 in。但是，如果是表示树上长有叶子呢？用什么介词？也是用 on 吗？

问题 此句中的现在分词作何成分？

This is because he can make 72 changes to his shape and size, turning himself into different animals and objects.这里句末的现在分词短语是什么成分？具体什么状语？另外，to his shape怎么理解？谢谢专家老师。

问题 may well的用法

may well是什么意思？它与may as well有什么区别？我这里有两个相关的例句，请老师帮我总结一下它们的用法与区别：What you say may well be true. 你说的很可能是事实。 If that is the case，I may as well try. 既然如此，我不妨试一试。

问题 句末现在分词短语（其前有逗号）作什么成分

But tourism is double-edged, boosting the economy but damaging the environment. 请问上面句子末尾的现在分词短语作什么成分？如果是状语，那它是什么状语？

问题 attract tourism还是attract tourists

通过查词典可知：tourism 的意思是“旅游业”，tourist 的意思是“游客”。所以要表示“吸引游客”就应该是 attract tourists，是的吧！但是看到这样一句，是不是错了：What the locals are trying to do is to attract tourism.这里的 tourism 难道...

问题 请问：句中的it是不是多余的

Apple hopes that the flashy new features of the iPhone 7, which it is expected to introduce in September, will convince customers to abandon older models.请问：句中的 it 是不是多余的？

问题 go hiking to the mountains不对吗

老师说下面的句子不对，但我不这样认为：If the weather is fine, we’ll go hiking to the mountains this weekend.请老师分析一下，谢谢！

问题 新概念3 Lesson 13句子问题

She heard the front door open and heavy footsteps in the hall.这里的the front door open中间是不是省略了 that is?如果open是形容词的话为什么句子要翻译成 她听见前门被打开,走廊里响起了重重的脚步声。

问题 时间状语从句省略了主语的问题

...heless, the potential for mobilizing toxic trace elements from the coalbed is an important factor to be considered when evaluating CO2 sequestration in deep unmineable coal seams.这个句子中when的后面直接接evaluating 而没有主语，时间转语从句也是句子啊，不应该有主语...

问题 for sb to do的用法

看到一个句子，high salaries are beneficial for people to improve their life quality.这里的 for people to improve 用的对吗？我看 for sb to do都是用在it is for sb to do的结构里。

问题 介词FOR在句中的意义

The FBI is investigating and said it will represent its findings to the US Attorney's office for the District of Minnesota for consideration of possible federal charges.    这个for在这里是表示专门管辖这个区district的office下属分支机构吗？