写英语作文可以用到的定语从句【一】
基本概念定语：用于修饰名词或代词的成分就叫定语。 定语从句：如果修饰某个名词或代词的定语是一个完整的句子，这个句子就叫定语从句。定语从句所修饰的名词或代词叫先行词。定语从句放在先行词后面。定语从句的引导：定语从句的引导词代替的是先行词。
1、当定语从句所修饰的名词是事、物时，用that/which引导，且that/which在定语从句中作主语或宾语。e.g:a.Thisisthepenthat/whichIboughtyesterday.
2.当定语从句所修饰的名词是人时用that/who引导，引导词再从句中做主语或宾语。
3.定语从句修饰的\'名词时地点时用which/that或where引导:若地点名词在定语从句中是作主语或宾语就用that/which引导，是作地点状语则用where引导，可与“介词+which”互换。作visited的宾语作介词in的宾语作work的地点状语
4.当定语从句修饰的名词是时间名词时：若在定语从句中作主语或宾语用that/which,作时间状语则用when,同样可与“介词+which”互换。
5.当定语从句所修饰的名词在定语从句中表示原因时用why。’tcomeisstillamystery.
6.当定语从句修饰的名词和引导词后面的那个词之间是所有关系时，用whose引导。女儿已经出国的那个人是位医生
7.一些特殊情况：
写英语作文可以用到的定语从句【二】
宾语从句的语序要用陈述句语序，但要注意当疑问词为主语时，句式为：疑问词+谓语+其他，问句和陈述句语序一样。
典型例题：I didn\'t know ?
A. What wrong was with her B.what was wrong with her
C .what wrong is with her D.what is wrong with her
解析：主句是一般过去时，从句要用相应过去时态，所以排除C和D;在what was wrong with her中，what作主语，所以问句本身又是陈述句语序，不用变化。
答案：B
写英语作文可以用到的定语从句【三】
This is my first week in ** Senior Middle School.Everything here is new for me.Our school is an old school but it`s very beautiful.I have 50 new classmates in my class.They`re all very excellent, I think, and I felt a little sad.Because I`m too common.But come to think of it,it`s a very good thing.I believe I can also be very excellent if I study with such excellent classmates.I didn`t know why Ms *** chose me to be the committee of study.But I know it`s a good chance for me to raise my ability.All I can do is do my best in the future.I am sure that Ms *** and my classmates can help me when I do something wrong. Because they`re all very kind.It`s a pleasure to work and study with them.I`m really very happy.I`m not an outstanding student in this class,but I can do the same thing like others.I believe I won`t make anyone disappointed.
写英语作文可以用到的定语从句【四】
1.从句为陈述句，常选择引导词that，that引导宾语从句无意义，不充当句子成分常省略。例句：He told us (that they would help us through the whole work.
2.从句为一般疑问句，常选择引导词if或whether，表示“是否”。在whether … or not结构中不能用if替换。例句：I don’t know if there will be a bus any more.
3.从句为特殊疑问句，常选择what,when,where,which,who,how等的疑问代词、副词作引导词。例句：He didn’t tell me when we should meet again.
