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英语中的情态动词和定语从句在中考中是重点，以下是整理的一些情态动词和定语从句的用法，希望能够带来帮助。
情态动词
1.考查情态动词表示“推测”的用法
表示肯定推测的情态动词有：must“一定；准是”，may“也许；可能”，might“或许”；表示否定推测的情态动词有：can't“不可能”， couldn't“不会”，may not“也许不”，might not“或许不”；can表示推测时不用于肯定句，may表示推测时不用于疑问句。
2.考查情态动词引起的一般疑问句的答语
回答must时，肯定答语用must,否定答语用needn't或don't have to。回答need时，肯定答语用must,否定答语用needn't。回答may时，肯定答语用may，否定答语用mustn't 或can't。
3.考查情态动词的意义
must “必须”；have to“不得不”； need “必须；需要”； can(could)“能；可能”；may (might) “可以；可能”； shall，will (would)“将；会；愿意；要”； should“应当”。
“had better (not) + 动词原形”表示建议；have to / has to ／ had to的否定，疑问形式要借助于助动词do ／ does ／ did。
定语从句
一．定语从句的功用和结构
在复合句中，修饰某一名词或代词的从句叫做定语从句。被定从句修饰的词叫做先行词。定语从句必须放在先行词之后。引导定语从句的关联词有关系代词和关系副词。例如：
This is the present that he gave me for my birthday
二．关系代词和关系副词的功用
关系代词和关系副词用来引导定于从句，在先行词和定语从句之间起纽带作用，使二者联系起来。关系代词和关系副词又在定语从句中充当一个成分。关系待客做主语，宾语，定语，关系副词可作状语。
（1）作主语：关系代词在定语从句中作主语时，从句的谓语动词的人称和数须和先行词一致。例如：
I don’t like people who talk much but do little.
The cars which are produced in Hubei Province sell very well.
（2）作宾语：She is the person that I met at the school gate yesterday.
The book that my grandmother gave me is called “The Great Escape”.
（3）作定语
关系代词whose在定语从句中作定语用。例如：
What’s the name of the young man whose sister is a doctor?
The girl whose father is a teacher studies very hard.
（4）作状语
I’ll never forget the day when I first came to Beijing.
三. 各个关系代词和关系副词的具体用法
1. who 指人，在定语从句中作主语。例如：
The person who broke the window must pay for it.
The boy who is wearing the black jacket is very clever.
2. whom指人，在定语从句中作宾语。例如：
Do you know the young man (whom) we met at the gate？
Mr Lee (whom) you want to see has come.
3. whose 指人，在定语从句中作定语。例如：
The girl whose mother is ill is staying at home today.
I know the boy whose father is a professor.
4. which指物，在定语从中作主语或宾语。例如：
A dictionary is a book which gives the meaning of words.
Here is the book (which) the teacher mentioned yesterday.
5. that多指物，有时也指人，在定语从句中作主语或宾语。例如：
I’ve read the newspaper that(which) carries the important news.
Who is the person that is reading the newspaper over there?
6. when 指时间，在定语从句中作状语。例如：
I’ll never forget the time when we worked on the farm.
He arrived in Beijing on the day when I left.
7. where 指地点，在定语从句中作状语。例如：
This is the house where we lived last year.
The factory where his father works is in the east of the city.