今天我们还来讲一下第三章代词中的疑问代词 which 和 what 的用法。我们先来看一下位置的用法，位置意为哪一个哪些？在上节课我们还讲到它既可以指人，也可以指物，既可以指可数名词单数，也可以指名词复数，还可以指不可数名词，具有名词和形容词性质。我们来看下这个例子，which is more beautiful this is one or that one 哪一个更漂亮？这个还是那个？ which CC are you going to visit this summer 你今年打算 uln 哪座城市？我们再来看一下 what 的用法。
what 意为什么可单独使用，也可以放在名词前，既可以代替或修饰不可数名词，也可以代替或修复可数名词，但数或复数在句子中作主语、宾语、标语、定语等。 what makes your love handle so much 是什么使你如此热爱自己的家长？ what do you usually do a weekend 你周末通常做什么？我是有法 other 你父亲是干什么的？这个 was 就是 what 加意思的缩写。 whatchannel do you like to watchbest 你最喜欢看什么频道？这些例子大家都可以看一下，我们再来讲下 what 的常见用法。
第一个就是询问职业 what 加 B 加主语。第二种就是 word 加助动词度加主语加度，what is your eldersister 你姐姐是干什么的？这个就是 what 加 B 加主语。第二个就是 what do you do for living me 和尾声，这个就是 what 加这动词 do 加主语加 do 第二种就是请问平行和天气情况。
what 加 B 加主语加 like what S your new both like 你的新老板是个怎样的？这个就是加 B 加主语加 like 第二个就是 what is the wizi like in your country at this time of year 你们国家一年当中的这个时候天气怎么样？这个也是 what 加 B 加主语加 like 第三种就是询问外貌和长相， what 加注动词 do 加主语加 look like I have never meet her what does she look like 我从未见过它他长什么样。第四种就是征求对方意见，询问对方情况，用 what about 这个形式， what about the two of us having a coffee 咱们两个去喝杯咖啡怎么样？好的，今天知识就讲到这，我们下期再见。
which用法？
which意思及用法：
adj.哪一个;哪一些
pron.哪一个;哪些
which的用法总结：
1、在后置的非限制性定语从句中代替上文出现的事物或情况(单数或复数)。
2、在问句中作为疑问代词，在名词从句中作为连接代词用，其含义为“哪个、哪些”。
3、如果非限制性定语从句的先行词不是指主句内容，而是指具体的人、时间、地点，则不用which。
一、关系代词that 和which 在定语从句中作主语和宾语，放在先行词和定语从句之间，起联系作用。指物时，一般情况下可互换。如： Here is the pen that/which you lost yesterday.(that/which 指物作宾语) A plane is a machine that/which can fly.(that/which 指物，作主语) He is the most careful boy that I know.(that 指人,作宾语) The man that works in this room is a chemist.(that 指人,作主语)
二、that,which 在从句中作主语时，不能省略。作宾语时在口语中和非正式问题中经常省略。如上例1 和中的that,which 都可省略。
三、关系代词在主语从句中作主语时，从句的谓语动词的人称和数须和先行词一致。 Wheat is a plant that/which is grown in the north of China.
四、在定语从句中，关系代词that 和which 指物时，一般没有区别，但下列几种情况中不能互换：
只能用that 的情况：
a)先行词为 all,everything,nothing,anything,little 等不定代词时(something 后也可用which)： Is there anything (that) I can do for you in town? That’s all (that) I know.
b) 先行词被序数词所修饰时： The first thing (that) we should do is to work out a plan.
c) 先行词被形容词最高级所修饰时： This is one of the most exciting football games (that) I have ever seen. The nanjing yangtse river bridge is the longest bridge (that) they have ever seen.
d) 先行词 被only,very,no,any,same,little,one of 等词所修饰时： This is the only thing (that) we can do now. He gave me the same pen (that) he borrowed from me. Do you have any books that were written by Lu Xun? This is the very book (that) I want to read.
e) 当先行词中既有人又有物时： The man and the car (that) you want to see are all here. 你相见的人和车都在这里。
f) that 可指人，which 则不能： Who is the man that is reading the newspaper over there?
g) 在 “the time when”等结构和某些时间状语中，when 常被that 代替，而且that 往往省略： I may leave here any time I want to. During the time I was there I visited him twice.
h)way 后面可根由that 引导的定语从句，但that 一般都省略： That was the way she looked after us.
在下列情况中，只能用which:
a) 放在介词后面做介词宾语时： This is the question about which we’ve had so much discussion. 但是，如把介词放在从句的后部，这时which 就可换为that 并常省略。如上例可改为： This is the question (that) we’ve had so much discussion about.
b) 在非限制性定语从句，无论指物指人，都不能用that。指物时，只能用which 和其他关系代词。如： All the books there,which have beautiful pictures in them,were written by him.
