which is的用法

which  is是典型的特殊疑问句形式，特殊疑问词加上一般疑问句。后面可以搭配多种疑问句，比如which is it?  which  is  mine?

which is的用法

which is用法的简单介绍：which is的中文解释为哪一个是…

1、系词be+表语时which is可省略，举例：

This is the book （which is） lost. 

这是那本丢掉的书。

This is the book （which is） written by Lu Xun. 

这是鲁迅写的书。

It's a historical moment （which is） exciting everybody.

这是一个让大家都兴奋起来的历史性时刻。

2、which is 后不是形容词，则不可省略，举例：

Jenny is reading a book which is her birthday gift。

Jenny看的那本书是她的生日礼物。

which is 和which of有什么区别

which就是哪一个的意思，所以which is 说明which单独做主语 is是动词。

比如：Which is your book?这个时候问句后面一定会出现名词。

或者which book is yours?也是表达相同意思 这个时候因为which后面已经有名词说明，之后就会是省略，避免重复。

which of 介词of后面要加一个名词 这个时候表达的是“……中的哪一个” 整体一起做主语。

比如：Which of these books are yours?

which is which用法分析

which is which（区分人或事物）谁是谁，哪个是哪个（常常与tell\know等连用）

used to talk about distinguishing one person or thing from another

The twins are so alike I can't tell which is which.

这一对双胞胎长得一模一样，我分不清谁是谁。

They all look so alike to me that I'm never sure which is which .

对我来说他们看起来全都非常相似，我永远搞不清哪个是哪个。

It's essential to know which is which as treatments will be quite different.

由于治疗的方法将会全然不同，因此弄清楚哪个是哪个很重要。

Tag the bottles now or we’ll forget which is which.

现在把这些瓶子加上标签，否则将来我们就忘记了哪个是哪个了。