有老师和书上认为指示代词this等的替代词是it,they.如：Is this Bob? Yes,it is.而不是Yes, he is.但是，朗文语法书上有这么一句原话：当所指的是人时，可以用he,she代替this/that.并附一例句：This is Mrs Jones. She is in charge here.有老师认为此...
Let us suppose that you are preparing a meal and keeping an eye on the baby at the same time.The telephone rings and this marks the prelude to an unforeseen series of catastrophes.While you are on the phone, the baby pulls the table-cloth off the table smashing half your best crockery and cutting hi...
Tan Yunxian (1461 — 1554) was a Chinese
physician who learned her skills from her grandparents. Chinese women at the
time could not serve apprenticeships (学徒期) with doctors. However, Tan passed the
official exam. Tan treated women from all walks of life. In 1511, Tan wrote a
book, Sayings of...
For the moment,Frank got a funny look on his face,and the tears began to well up in his eyes."It wasn't long after that when my Dad went to sea and never came back."句中的when引导时间状语从句，和前面的it是什么关系？
I have seen trees, _____ open at sunsise and close at the sunset.A of which leaves B whose leavesThere are altogether elenven books on the shelf of which five are mine.请问什么时候才能of which后加名词？第一句跟第二句的区别是什么？
各位老师们，请问:Whether we can have clean
drinking water lies in what effective measures will be taken by the
government about water pollution. 句中的what成分如何分析？what是可以做限定词修饰名词吗？和what time is it？类似，有没有相关的语法点?
He arrived in the
afternoon, when nobody was home.
This is the town
where I was born.
I visited Paris,
where I spent a wonderful week.
请问老师，when的先行词是arrived吗？二三句中，where的先行词分别是 the town和visited吗？
The XPS board was produced by Harbin Xin Hai Trading Co., Ltd. Its thickness is 10cm in the NSTIL, which was decided by the relevant research results [28]此句中，Its thickness is 10cm in the NSTIL中的is，和which was decided by中的was是不冲突？是不是要将is改成was才合适？
.../While living in London,I picked up English.（不能用As）案例二when 和 while 后可接现在分词、介词短语、形容词等构成省略句，但 as 一般不这样用：When [While] reading, he fell asleep. 他看书时睡着了。When [While] in trouble, ask her for help. 遇到麻烦...