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问题 时态中时间承载词疑问

...为什么进行态用be作为时间承载词，例如:现在进行时:am/is/are（进行态动作时间承载词） doing（进行态）？为什么完成态用have作为时间的承载词，​例如:现在完成态:have（完成态时间承载词） done（完成态）？

问题 “为女儿读故事”应该是to还是for

那位年轻的妈妈正在为她的女儿读故事  The young mother is reading a story ___ her daughter.各位老师好，这道题的答案是to，但通过翻译引擎结果是for。请指教。

问题 小于1的小数修饰名词用单数还是用复数

很是奇怪，下面的句子中grams用了复数，但是修饰它的数字是0.2：A carat is equal to 0.2 grams. 1克拉等于0.2克。请问一下：小于1的小数修饰名词用单数还是用复数？

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 莎士比亚的一句话(涉及省略句)

There is nothing either good or bad, but thinking makes it so.请问 nothing 和 either 是不是省略了一些成分？如果是，那为什么可以省略？

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 if与whether的区别与选择

I 'd like to go swimming _______ the water is not too cold.A.unless    B. for      C. if     D. whether 答案为if。D 为什么不行呢？

问题 would have to的用法

看老友记一段里看到的，两个人装好家具后，发现有一个支架竟然落下了，没装进去。—I think we've got a bookcase here. —But what's this?—Well...I would have to say that is a bracket.请问这里的 would have to 是什么用法？

问题 while/when/as的用法辨析与区别

While the host enters, the house band plays a theme music that is often played during the show. 请问这道题中能用as,when, 但能不能用while？

问题 by 4% to 5%的理解疑问

This development is boosting wholesale demand from the food service segment by 4% to 5% a year across Europe, compared with growth in retail demand of 1 to 2 percent.请问老师，by 4% to 5% a year across Europe 如何理解？谢谢！

问题 in which和that的区别

Table tennis, also known as ping-pong, is a sport in which two or four players hit a lightweight ball back and forth across a table using small rackets. 请问in which可以用that替换吗？