定语从句中which能放在逗号后面的句子的开头吗？
用作关系代词的有who,whom,whose,that,which,等who(主格，在东距中用作主语),whom（宾格，在从句中用作宾语）,whose（属格，在从句中用作定语）指人。
that在从句中既可用作主语，亦可用作宾语（作宾语时可省去）；既可指人，又可指物。
which 在从句中既可用作主语，亦可用作宾语，一般指物。
which亦可作宾语和表语
例：We told him to consult the doctor,which advice he took.
先行词指人时，关系代词可用that,who,但关系代词在从句中作主语时，多用主格who
1、that与which的区别。
1）用that而不用 which的情况：①先行词为不定代词all, anything, nothing, …；②先行词有最高级修饰，有序数词修饰；③先行词有only, very, any等词修饰；④先行词既有人又有物时。
e.g. There is nothing that can prevent him from doing it. 没有什么能阻止他不干那件事。
The first place that they visited in Guilin was Elephant Trunk Hill. 在桂林他们所参观的第一个地方是象鼻山。
This is the best film that I have ever seen. 这部电影是我看过的最好的一部。
Mr Smith is the only foreigner that he knows. 史密斯先生是他认识的唯一的外国人。
2）用which而不用 that的情况：①引导非限制性定语从句；②代表整个主句的意思；③介词 + 关系代词。
e.g. He had failed in the maths exam, which made his father very angry. 他数学考试没有及格，这使他的父亲很生气。
This is the room in which my father lived last year. 这是父亲去年居住过的房子。
3）as引导定语从句时的用法
①as引导限制性定语从句通常用于the same … as, such … as结构中。
e.g. I want the same shirt as my friend’s. 我要一件跟我朋友一样的衬衫。
Such machines as are used in our workshop are made in China. 我们车间使用的这种机器是中国制造的。
②as引导非限制性定语从句既可放在主句之前，也可放在主句之后，用来修饰整个句子。通常用下列句型：as is known to all, as is said, as is reported, as is announced, as we all know, as I expect 等。
e.g. As I expected, he got the first place again in this mid-term examination. 正如我所预料的那样，他在这次期中考试中又获得了第一名。
3）as 引导非限制性定语从句时与which的区别
①当主句和从句语义一致时，用as；反之，用which来引导非限制性定语从句。
e.g. He made a long speech, as we expected.
He made a long speech, which was unexpected.
②当非限制定语从句为否定时，常用which引导。
e.g. Tom drinks a lot every day, which his wife doesn’t like at all.
2. 关系代词在从句中作主语时，从句的谓语动词单数还是用复数应由先行词决定。
e.g. The man who lives downstairs speaks English fluently. 住在楼下的那个人英语说得很流利。
The students who are in Grade Three are going to climb the hill tomorrow.
3. 定语从句有时不直接紧靠先行词，中间由一个定语、状语或谓语隔开。
e.g. There is an expression in his eyes that I can’t understand.
4. 引导定语从句的关系副词有时可以用“介词 + which”来代替。
e.g. October 1, 1949 was the day on which ( = when ) the People’s Republic of China was founded.
5. 当定语从句中谓语动词是带介词或副词的固定短语动词时，短语动词的各个固定部分不要拆开。
e.g. The sick man whom she is looking after is her father.
6. 介词在关系代词前，只能用which和whom，且不能省略；介词在句尾，关系代词可有which, that, whom, 口语中也可用who，且可省略。
e.g. The man (whom/ who/ that) you were talking about has come to school.
（二）限制性定语从句与非限制性定语从句
1、限制性定语从句：从句与主句关系密切，去掉从句，主句意义不完整，甚至不合逻辑。
e.g. I was the only person in our office who was invited.（去掉定语从句，意思就不完整）
2、非限制性定语从句：从句对先行词关系不密切，去掉定从句，意思仍然完整。形式上用逗号隔开，不能that用引导。
e.g. Tom’s father, who is over sixty, still works hard day and night.（who引导非限制性定语从句，整个句子可分成两句来翻译）
作为疑问代词，它们一般用于疑问句（比如where are you from？你来自哪里？）。
其他用法则视具体情况而定，作为关系代词在定语从句中：He is the only one in our class ，who can attend the swimming game.(他就是我们班唯一能参加游泳比赛的人)，前面不加逗号是限制性定语从句，加逗号的是非限制性的。
如：She loves her hometown very much，where she spend her happy childhood.(她非常爱她的家乡，在那里她度过了欢快的童年)。两者意义上的区别不大。
另作为名词性从句的引导词，后可以接不定式或一般陈述句，如：I don't know what to do next(我不知道接下来做什么)，What he said is wrong(他说的话不对)。
扩展资料：
1．用which不用that引导定语从句的三种情况：
①在引导非限定性定语从句时，和在介词后不能用that，应用which。如：
Football，which is a very interesting game，is played all over the world．
②先行词为that时，为了避免重复，定语从句用which不用that引导。
如：That which you borrowed from me wasn't a real diamond necklace．
③介词后用which不用that引导。如：
The method with which you solved the problem is very good．
2．用that不用which的七种情况：
①先行词前有形容词最高级或序数词修饰时，用 that不用which引导。如：
This is the best place that I have ever visited．
The second question that is asked is why we don't fall off the earth．
②先行词为little，much，all，none，few，（the）one， something，everything，nothing，anything等不定代词时，用that引导。如：
There is nothing in the world that can frighten him．
③先行词既有指人的名词又有指物的名词时，用 that引导。如：
He told us about the people and the cities that he had visited．
④先行词前有any，all，no，few，every，some，little， much，（the）very，（the）only，（the）last等词修饰时，用 that引导。如：
This is the very coat that I need．
Is oxygen the only gas that helps fire burn？
⑤先行词为which时，为了避免重复，用that引导。如：
Which is the book that you bought yesterday？
⑥先行词在从句中作表语时，常用that引导。如：
Shanghai is no longer the city that it used to be in the 1930's．
⑦当主句是There be．．．句型时，用that引导。
There are two tickets for the film that are for you two．
参考资料来源：百度百科：引导词
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