人教版高中英语必修第一册Unit4Natural disasters 定语从句第二讲 课件(14张ppt)

(共14张PPT)
定语从句第二讲
必修一
限制性定语从句
关系副词 先行词 在定语从句中作的成分
when 时间名词 时间状语
where 地点名词 地点状语
why reason 原因状语
定语从句中关系副词的作用
引导作用：引导定语从句。
包含作用：在意义上，关系副词等于“介词+先行词”；在结构上，每个关系副词都可以转换为“介词+which”，实质是个介词短语，相当于副词，所以称其为关系副词。
成分作用：因为是副词，所以他们都在定语，从句中充当状语。
I still remember the day when I was awarded the prize.
The farm where the work is not far from here.
He didn't tell me the reason why he was so upset.
例句：
where引导定语从句时先行词可以表示抽象的地点，如：
reach a point where...(达到一种......的地步）
in a case where...(在一种......的情况下）
in an activity where...(在......的活动中）
in a situation where...(在......的局面下)
In the job where...(在......的工作中）
where引导定语从句的特殊用法
定语从句中的介词，有时可置于关系代词之前，形成“介词+关系代词”的结构。
“介词+which”有时可以代替when、where、why.
“介词+whom”在定语从句中，没有与之对应的关系副词可替代。
介词+which/whom，引导定语从句
特殊用法一：
I will never forget the days on which (=when) we studied together.
This is the town in which (=where) shakespeare was born.
There is no reason for which (=why) we shouldn't be friends.
In the street there wasn't a single person to whom she could turn.
例句：
“介词+关系代词”引导的定语从句中介词的选择：根据介词与动词或形容词的固定搭配确定用什么介词。
介词+which/whom，引导定语从句
特殊用法二：
This is a subject about which we might argue for a long while.
例句：
特别注意
有些含有介词的动词短语不能拆开，从而不能将介词提到关系代词前面构成“介词+关系代词”引导的定语从句，比如look for，look after，take care of等。
The patient whom my sister is looking after is getting better.( ）
例句：
The patient after whom my sister is looking is getting better.（×）
用关系副词或（介词+关系代词）填空
I still remember the day ______ / ______ ______ I first met Jennifer.
They consider summer vacations as a time______ / ______ ______ relaxing and having fun is a necessary part.
We have come to a point______ / ______ ______ it is different to reach an agreement.
用关系副词或（介词+关系代词）填空
I still remember the day ______ / ______ ______ I first met Jennifer.
They consider summer vacations as a time______ / ______ ______ relaxing and having fun is a necessary part.
We have come to a point______ / ______ ______ it is different to reach an agreement.
when on which
when in/during which
where at which