If we decide that language did originally develop, possibly involving
from animal communication, we can only do so by assuming evolution to be a
universally valid principal. 这句话改错说把by去掉。请问老师so这里指代什么，不去掉by好像也翻译的通。
Other examples might be where one student is given a picture and describes the picture for another student to draw, or where students draw each other's family trees. 老师好！这里的where是什么用法？是引导表语从句吗？可是这里没有疑问的意思啊？
Making a timeline that shows when different events happened can help
you understand how the events are connected to each other.本句摘自高中英语新教材（人教版）必修二第1单元(p5)。请帮忙分析一下句子结构并翻译一下，谢谢！
...nbsp;recalled later, "I decided on my change of front—to turn to the right-about, and face to the South." 后来阿蒙森回忆到，“听到消息的那一刻，我遍打算转变自己的前沿阵地——转向相反的...
...是连词（引导词）吗？以 but 为例：1. But there are some parts of the world where even now people cannot write.2. But the first people who were like ourselves lived so long ago that even their sagas, if they had any, are forgotten.请问：我觉得 but 放在句首时是副词。如果 ...
... the business.Thanksgiving is when people celebrate the harvest.The spread of the disease is when people get together.请问：这3个is 是否都是系动词？这3个when 引导的从句，分别是什么从句？这3句话该怎么翻译？
That’s where Mother usually is at this time of day.请问老师这里的 where 怎么解释？我的理解是：这里的 where 是从属连词，where 引导的是表语从句。我的疑问是：where 既然是从属连词，怎么它在表语从句还是担任了表语呢？不是说，从属...
...什么要把should 去掉?并且有时态的变化? ②It is foolish of the girl not to have asked your name. 答案:
Foolishly,the girl did not asked your name. 否定形式应该怎样改写呢? 英语基础不太好，希望老师能够解答，谢谢
...样的句子，…，thereby preventing the DC bias conditions of one stage affecting the other.这句话意思不难理解，就是防止一级的直流偏置状态影响另一级preventing应该是结果状语，可后面还有个affecting, 我觉得是个现在分词作宾...
老师您好。Tired and disappointed, the resure team finally reached ______ used to be a village.这里的空填what。
答案说这是名词性从句，但我觉得空前面不缺成分，reach 不是个不及物动词吗？后面又缺成分，应该是个定语从句啊。谢谢老师的...
I felt extremely exicted as it was the first time taht I ______ abroad at all.A. have ever beenB. would have ever beenC. had ever beenD. was ever这道题为什么选择过去完成时？
老师您好！I should have written a thank-you letter for the lovely scarf you sent me for my birthday upon receiving it.本句中存在定语从句，即 you sent me 做 the lovely scarf 的定语。upon 在本句中该如何理解？盼复！