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问题 make sure 后面为什么用过去完成时

In future, I would make sure I'd checked out whoever was fitting it with their previous customers.请问 make sure 后面的从句中为什么用过去（完成）时而不用现在（完成）时？

问题 若过去的情况为客观事实该用什么时态

看到一个句子：The contribution of tourism to GDP was CNY1830 yuan in 2016.这里的 was，我有点理解不了。虽然2016是过去的时间，但是我是现在此刻在说一个客观事情，有必要用过去式吗？

问题 four years前面是否可以看做省略it was

In 1965, four years before Neil Armstrong walked on the Moon, Barbie became an astronaut. 这里的four years前面可以看做省略了it was吗？

问题 不定式所作成分分析

...g from learner centered progressive education to an emphasis on structured intellectual discipline to calls for radical reform in the direction of openness to the recently rally to go back to basics.老师好，请问最后to go back to basics作什么成分？如果是定语，那么与名次是什...

问题 worth与worth of的用法

老师好，下面句子里，Huge progress has been made against these diseases since an agreement in 2012 by pharmaceutical firms to donate billions of dollars’ worth of drugs. “billions of dollars’ worth of drugs”为什么要加worth of？直接说 billions of dollars’ drugs不行么？...

问题 分词短语 替代问题

① Taking off his shoes, Ram walked into the house. 为什么等于(=Having taken off .........)② Having broken her leg the last time she went, Lucy decided not to go on the school trip this year.  此处又不等于 （≠ Breaking her leg........）③ Having hunted close to extinction, th...

问题 bourgeois的是指中产阶级还是资产阶级

bourgeoisbelonging to the middle class中产阶级的interested mainly in possessions and social status and supporting traditional values追求名利且平庸的 supporting the interests of capitalism资产阶级的

问题 and是多余的吗（and to run pumps）

There is electricity in our house and to run pumps.这里为什么有and呢？去掉and不也是可以的嘛？

问题 This was the crucial period which modern drinking

改错题，答案是在which前加in,可以把which改为when吗

问题 A year more到底是什么意思？

原句是The English language teaching sector directly earns nearly &1.3 billion for the UK in invisible exports and our other education related exports earn up to &10 billion a year more.网上对这个短语众说纷纭，感觉都不太对。

问题 句子分析

Two weeks ago, voters in Taiwan, the island democracy that Mr. Xi has made clear should join a greater China, resoundingly re-elected a president despised by Beijing. --此句子来自纽约时报，不代表我个人政治立场。that从句我理解为是修饰democracy的定语从句，但...

问题 even 与 even though/if 可以替换吗？

He was still enthusiastic for the scheme even in tiems of difficulty.例句中的even，可以用even though ,even if替换吗？ 另还问一下老师，for the scheme是句子的什么成分？

问题 一篇雅思作文里句子的疑问

Consider,for example,students who live in remote areas without roads or funds to pay for tuition to attend a school far away,an Internet connection solves this.（远程教育的好处）这个consider在这里做祈使句的谓语，students做宾语，就已经是完整的主句了，为什么逗...

问题 句中by的用法

Adele has been accused of cultural appropriation by marking what would have been Notting Hill Carnival weekend by posting a picture of herself with African-style knots in her hair on Instagram. 1. 句子中by marking...是表示原因吗？by posting...是动作marking what would have been Notting ...

问题 代词the others\others

-- Did all the students in your class pass the test?---- Some of them did. ______ didn’t.A. Another    B. The others    C. Some other    D. Others这道选择题作业帮中有的答案是B，有的答案是D ，如果班上有同学没有参加考试，是不是应该选D;如果全班都...