问题 为什么前面用could而最后一段用can呢

为什么第一段这里要用could而最后一段用了can呢？用could那里如果是因为虚拟语气，主句为什么没有用虚拟语气呢？

问题 during childhood与during one’s child

下面句子用的是during childhood： The girl became blind during childhood. 这女孩童年时就失明了。 请问一下，这个during childhood可以说成during her childhood吗？感觉during后面直接跟名词有点怪怪的。

问题 some作主语时谓语动词用单数还是复数

问题 sky前用a与the的区别

...r in the sky. 太阳爬高了。There was a kite high up in the sky. 高高的天空中有一只风筝。老师说如果sky受到描绘性形容词的修饰，前面也可以用a，但老师没有举例。请老师举例说一下，谢谢！

问题 with 复合结构用to do与doing

人教2019 必修第二册Unit 3第28页：At age 50, she found herself out of work and stuck at home with only her computer to keep her company.这句话中我觉得用keeping 更合适。不知道大家是什么看法。

问题 判断是过去进行时还是现在分词作状语

...》kid词条下的一个例句：I can remember the strange feelings I had when I was a kid looking at those photographs. 我还能记得小时候看那些照片时的奇特感受。对于句中looking，它是与 was 一起构成过去进行时，还是现在分词作状语? 请专家指教，谢...

问题 He is the only child in/of his family.用in还是of

He is the only child in / of his family. 这句话中式用 in 还是用 of?

问题 分析不定式 to recognize a masterpiece

He knows enough about art to recognize a masterpiece when he sees it.这里的不定式to recognize a masterpiece怎么分析？

问题 关于how不用于“比较”的疑问

下面的内容摘自《牛津英语用法指南》（第三版）第252节：how进行比较时，我们用 as 或 like或 the way，不用 how：Hold it in both hands, as / like / the way Mummy does. 用双手捧住，像妈妈那样。（不能说：... how Mummy does.)但我实在没有看出来...

问题 both用法

下面的both用法是副词吗？ //The Wallaces ,both children of church minister,had a clearly formula for their magazine. //He visited the Institute of Neurology in Havana where they both worked. //We have both worked there. 为什么不能用 Both of boys have been ill，而可以说 Both o...

问题 这两个句子中为什么用where来修饰

These frequently are not enforced in the context of civil wars where non-state actors are involved.The statistics inversed where up to 90 percent of casualties during conflict were civilians.这两个句子为什么用where?

问题 能否用the other one替代another one

老师们好，请问这个句子能否用the other one替代another one?Students are taught in two languages, English and another one, such as French, German or Japanese。这里为什么不用the other one?

问题 a…or two 作主语时谓语动词用单数还是复数

请问一下，a…or two 作主语时谓语动词用单数还是复数？比如：A scandal or two add / adds a little spice to office life. 

问题 表示“过了某个地方”用什么介词

过了邮局，请向右拐。________ the post office, please turn right.要求填入一个介词。

话题 时间段作主语，谓语动词要不要用单数？