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(共33张PPT)
My precious
主题活动
Task 1：What is “precious”
01
02
03
If no one thinks you can,
then you have to .
如果没有人认为你行，那么你就必须得行
If
状语从句
一、定义：
状语从句是一个句子在复合句中充当状语，修饰主句中的动词、形容词或副词等。
何为状语，就是给一句话提供时间，地点，原因，条件，目的等成分，在这里表示动作发生的时间。
I heard the news when I was having lunch.
这也是一个主谓宾句型，但是状语由一个词变成了一个句子，如果状语是一个句子，那么这就是一个状语从句。
If 引导的条件状语从句
定义：
if “如果, 假如” 它引导的句子表示某事发生所需的条件，即“在…条件下，某事才能发生”，在句子中充当状语，因此称之为条件状语从句。
eg: If I make a lot of money, I'll travel around the world.
=I'll travel around the world（主句） if I make a lot of money（从句）.
位置：
从句可放在主句之前或之后，但是放在主句之前须有逗号隔开
She will be late.
If she _____ to school, she _____ ___late.
She is going to
walk to school.
walks
will
be
It is going to rain tomorrow.
I will stay at home.
If it _____ tomorrow, I _____ _____ at home.
rains
will
stay
If it ____ sunny tomorrow, they _____ ______ a trip.
It will be sunny tomorrow.
They will have a trip
tomorrow.
is
will
have
时态的运用：
1）如果主句是一般将来时，从句则用一般现在时。
(主将从现）
eg: If it rains ，I will stay at home.
I’ll go with you if you don’t want to go alone.
2) 主句是含有情态动词 may/ might/ can/ must/ should
等的句子。从句要用一般现在时。
（主情从现）
eg: If you want to be healthy, you should eat less meat.
If you finish your homework, you can go home now.
3) 主句是祈使句时，从句也用一般现在时。
（主祈从现）
eg: Please let me know if someone calls me.
Don't play basketball if you don't finish your homework.
注意：
为了避免重复，条件状语从句中常使用do( does, did ) 来代替上文提到的动作。
- I think I will ride my bike.
- If you do, you'll be late.
条件状语从句
其他引导词：
unless(除非，如果不)=if...not
so/as long as(只要)
in case(万一)
once(一旦)
1.You will never gain success you are fully devoted to your work.
2.The doctor share his phone number with the patient ______ they need medical assistance.
3. you have a dream, keep working hard and you will succeed.
4.You will be successful in the interview ________ you have confidence.
unless
如果不，除非
in case
以防万一
As long as
只要
once
一旦
Task 2:Find the precious.
The Ring
Where is the “precious”
For the time will soon come,
when Hobbits will shape the fortunes of all.
时间状语从句：
引导词：
常见连词有
when(当……时), while(与……同时), as(当……时),
before(在……之前), after(在……之后), till/until(直到……),
not... until(直到……才), since(自从……以来),
as soon as (一……就……), whenever(无论什么时候), hardly... when...(一……就……),
no sooner... than...(一……就……)等。
（一）when while as
注意1：When： 既可引导持续性动作，又可引导短暂性动作。
While：指的是“在某一时间里”， “在……期间”，从句里的动作必须是持续性的。
When he came back, his mother was washing clothes.
While he lived in China, I was a child.
当when, while,as表示“在…一段时间里”，主从句的动作同时发生时，可以换用。
注意2：as引导持续性动作，侧重主句和从句的动作同时发生. “一边…一边…”
He hurried home, looking behind as he went.
as也可表示“随着”，但要注意与with的区别：
as 是连词接句子。with 是介词，构成复合结构。
As the day went on, the weather got cold.
With the day going on, the weather got cold.
(as 引导从句，故用谓语动词)
（with 是介词，故用非谓语）
即学即练
(　　)①I was about to go out for a walk 　　　　 my uncle came in.
A. as　 B. when　 C. while　 D. and
【解析】　本题考查时间状语从句。句意：我正打算外出散步时，我舅舅来了。be about to do...when...是固定句型。故选B项。
即学即练
(　　)②They walked on 　　　　 they had a short rest.
A. before　 B. after　 C. until　 D. when
【解析】　本题考查时间状语从句。句意：他们短暂休息过后继续向前走。after意为“在……之后”，符合语境。故选B项。
即学即练
(　　)③　　　　 he got ready to leave home, his parents came to his home.
A. While　 B. As　 C. Until　 D. If
【解析】　本题考查时间状语从句。句意：当他准备离开家时，他的父母来到他的家。A项意为“当……时候”；B项意为“当……时候”；C项意为“直到”；D项意为“如果”。根据句意可知，此处为时间状语从句。while和as都可以引导时间状语从句，但使用while时，主从句的动词要用延续性动词，要用进行时。故选B项。
即学即练
(　　)④You'd better tidy up your room 　　　　 your father comes back.
A. so　 B. or　 C. before　 D. but
【解析】　本题考查时间状语从句。句意：你最好在你父亲回来之前清理你的房间。A项意为“因此”；B项意为“否则”；C项意为“在……之前”；D项意为“但是”。根据句意判断，此处应填写表示时间的连词。故选C项。
（二）before after (conj,prep)
before 可翻译为“还未… 就… ，在....之前” 等.
before 句型：
It will be+一 段时间 +before …过要多久才…
It won’t be+一段时间+ before ... 用不了多久就…
It was +一段时间 +before …过了多久才…
It wasn’t +一段时间 + before ... 没过多久就…
It won’t be long before we meet again.
It was three days before he handed in the report.
2、如果主句谓语动词是持续动词，通常用肯定式的主句，表示“直到…为止”.
I worked till (until) he came back.
3、如果主句谓语动词是瞬间动词，则主句用否定式
表示“直到…才.
I didn’t go to bed until (till) he came back .
(三) till和until (直到......)
1、till 不可以置于句首，而 until 可以。
(四) since/ever since ( 自从.......)
注意：since 句型：
it is /has been +时间段+since sb. did sth.
表示“自从……有多久了”
Great changes have taken place in our school since you left.自从你离开，我们学校发生了很大的变化。It’s almost five years since we saw each other last time. 我们上次见面差不多五年。
(五）as soon as 一 … 就
注意:
用no sooner …than，hardly…when 引导的从句表示“一……就……”，主句中的动词一般用过去完成时，从句用过去时，若把 no sooner, hardly/scarcely/barely 提到句首，主句用部分倒装.
He had no sooner got to the lab than he set out to do the experiment.
该句倒装为：
No sooner had he got to the lab than he set out to do the experiment.
注意：
时间状语从句中谓语动词不能用将来时，只能用现在时或过去时表示将来时。
He won’t go to bed until she returns.
直到她回来他才去睡觉。
He wouldn’t go to bed until she returned.
直到她回来他才去睡觉。
“What is your precious ”
Task 3:How to find “precious”.
First
you should make it clear that
When I was young , I ....
When I am getting older, I...
If ..., ...
Write an article about your precious at different ages.
要求：1. 作文不少于80 词。
2. 文章内容包含”条件状语从句“和”时间状语从句“
To Be Continued...

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