问题 tuck sb in/up的词典解释

牛津词典给出的解释是: to make sb feel comfortable in bed by pulling the covers up around them. 意为把...的被子掖好我想问下pull up这里应该怎么理解？pull是拉起来的意思，up作小品词可以理解为改善吗？

问题 ​to/on/in the north of

to/on/in the north of……中的介词都可以省略变成north of ……吗？还有The Great Wall is north of Beijing中省略的介词是什么呢？这两个问题我实在找不到答案，谢谢各位大神帮忙解疑。

问题 in the need to do sth 的理解

These firms have been given a tough lesson in the need to diversify their markets.请问红色部分怎么理解？

问题 in the 1980s中的1980s是复数吗

在 in the 1980s（在20世纪80年代）这类用法中，1980s是一种复数吗？有人说它是复数，但我觉得它不能算是复数吧，因为 1980s 并不表示很多个 1980。如果说它是一种复数，有相关的依据吗？

问题 分析：A friend in need is a friend indeed.

我知道 A friend in need is a friend indeed 是一句谚语，意思是：患难见真情。患难朋友才是真朋友。患难之交才是真朋友。但我对这个句子的结构不甚理解，主要疑问有二：疑问一：句中的 in need 是什么意思？作什么成分？疑问二：in...

话题 among、in、inside、within和into

话题 疑问词 in what other ways

话题 最高级后面接介词in还是of

问题 is based后面为什么没有介词in

The plan needs to include Operational information such as where you business is based, who your suppliers are and the premises and equipment needed.is based后面为什么没有介词in？

问题 the following month前面为什么不加介词in

老师，这个the following month前面为什么不加一个介词in哇？

问题 When he came in, all stopped talking.错在哪

下面的句子有错吗？When he came in, all stopped talking.谢谢！

问题 in cities为什么翻译是在这个城市里

A lot of people in cities here take the bus also.翻译：在这座城市里，很多人们也乘公交车。cities不是复数吗，为什么是翻译成这座城市（单数）？also为什么可以放在句尾？ 

问题 介词+which引导的定语从句

A republic was any form of government in which sovereignty resided in the people, not in a separate ruling class or a king, and where the people were citizens and not merely subjects.句中前半句定语从句“in which sovereignty resided in the people”的先行词是form还是government，如...

问题 这里面in the process表达的是什么意思

Like most living things, the vast majority of animals gradually degenerate after reaching sexual maturity in the process known as aging.

问题 over / in the past few years的区别

如题，想请教各位老师，时间状语用over+时间段/ in+时间段有任何区别吗？从意思上看似乎没有什么区别，那从与主句时态搭配的情况下看呢？