话题 more or less

话题 his or her

话题 a…or twoy

话题 连词and or用法

问题 keep doing和have been doing区别

只是keep doing不能跟时间段，而have been doing可以跟的区别吗？

问题 如何理解这个谓语结构(will have been being worked)

老师说，By the end of next month, the project will have been being worked for 3 years.是将来完成进行时的被动语态。谓语 will have been being worked 太复杂了，不是很懂。一定要死记硬背吗？

问题 have been to 的用法

...;   B. didn't see; have; goneC. haven't seen; have; been     D. haven't seen; have; gone答案选C,老师我想问下第三空为什么不是been to.

问题 分析一个词典定义句子的结构（涉及or并列成分）

柯林斯词典对 adequacy 的定义是这样的：Adequacy is the quality of being good enough or great enough in amount to be acceptable. 我看不明白这个句子的结构，尤其是看不清这里的 or 是将哪两个成分并列了。

问题 whether...or...是什么词（引导什么从句）

请问专家：whether...or...是什么词性？它用于引导什么从句？麻烦专家老师举例说明一下，谢谢！

问题 done与have been done作状语时的区别

老师好，请问 Having been simplifies a few times, the math problem is very easy for the students to solve.这里的非谓语是Having been done，我想问问可以填simplified吗？  作为非谓语如何在考试中区别呢?

话题 will have been napping

话题 must have been to

话题 shoudl have been broken

话题 to have been flying

话题 had been used to