2022届高考英语二轮复习：状语从句的省略及as用法课件（18张）

(共18张PPT)
The Adverbial Clause
状语从句
定语从句
状语从句
名词性从句
三大从句
主语从句
宾语从句
表语从句
同位语从句
时间
地点
原因
条件
让步
方式
目的
结果
比较
状语从句的两个问题
1. “主将从现”
在条件，时间和让步从句中，用一般现在时表示一般将来时，主句用将来时态。
I will write to you as soon as I get home.
They’ll stand by you even if you don’t succeed.
2.状语从句的省略：
在条件，时间，让步，方式状语从句中，如果从句的主语和主句的主语一致或者从句的主语是it,而且谓语包含有be动词，
可以省略主语或it, 跟be动词。
1、While (I was) in Beijing , I paid a visit to the Summer Palace.
2、Come tomorrow, if (it is ) possible.
3、If so ,you must go back and get it.
4、She stood at the gate as if (she was ) waiting for someone.
5、Though (it was) cold, he still wore a shirt.
While visiting the butterfly exhibition in the museum，I came across one of my former fellows.
Although astonished at the outcome of the election，Mr Zhang didn＇tsay anything before his fellows.
(4)省略后的句型：连词+现在分词/过去分词/介词短语/形容词
If involved in this case,you will be punished.
If necessary, you can choose me to make the presentation.
... ... ........做报告
以下为约定俗成的省略形式：
if so如果是这样的话
if not如果不是这样，否则
if ever如果曾经有的话
if any如果有的话
if necessary如果有必要的话
if possible如果可能的话
when necessary 在必要的时候
单句语法填空
①Though_______ (criticise) by the head teacher,Sandy was still grateful to Mr White.
②Though______ (annoy)at Tom's words,she forced a smile.
There are some health problems that,when not ________(treat)in time,can become bigger ones later on.
④[2020·天津二考]Harriet Stowe，mother of six，wrote parts of Uncle Tom’s Cabin while ___________(cook).
⑤[202l·全国乙卷]I was considering this while _______(work)as a nurse just a few weeks ago.
完成句子
⑥___________(如果可能的话) ，I will learn to carve.
⑦__________________(在必要的时候) ，I will step out of my comfort zone.
⑧ __________________(如果有必要的话)，we will grow some waterlily in the pond，which is located at the backof our house.
criticised
annoyed
treated
cooking
working
If possible
When necessary
If necessary
as 用法
as 引导时间状语从句
从句谓语一般为延续性动词。
(1) as 着重强调主句和从句的动作同时或几乎同时发生，如：
The students rose as the teacher entered the classroom.
(2)as还可以表示“随着……”，如：
As time goes by, it is getting colder and colder.
(3) As 还能表示“一边……一边”，如：
We always sing as we walk.
4．如果主句表示的是短暂动作，而从句用延续性动作的进行时态表示在一段时间内正在进行的动作时，when, while与as 可互换使用。如：
When/While/As I was walking down the street, I came across an old friend of mine.
______________ I was walking along the street, I noticed a police car in front of the store.
________ John arrived, I was cooking lunch.
_______ he grew older, he lost interest in everything except gardening.
When/While/As
When
As
as引导原因状语从句
1.as“由于”，语气最弱，表示往往是十分明显的原因，双方都知道的原因。常放在句首，比较口语化。
2.because直接原因，非推断．语气最强．回答why
3.since/now that表示“既然”，语气较弱；强调对方已经知晓，无需加以说明的原因，只可以放在句首。
4.For 放句中，对前面一句话的内容的补充说明 。
I did it because he had told me to.
As it is raining, we shall not go to the park.
Now that/ Since everybody is here, let's begin our meeting.
This book is different from that book in that this one is about chemistry and that one about history.
Considering that he received no help, his results are very good.
as引导让步状语从句
He went out, _______________ it was raining.
_____________________ they are poor, they buy a great many books.
Child ____________ he is, he has learnt advanced mathematics.
though/although
Although/though/while
as/though
注意：
1. while引导让步状语从句（句首）
2. as/though引导让步状语从句（一定倒装）
3. though还可作副词“不过，然而”,放句末
It was hard work, I enjoyed it, _______.
4.有时when也可以引导让步状语从句，常在句中
Suddenly, she stopped when she ought to have continued.
though
You should do _____I do.
Leave the table ____ it is.
入乡随俗。
as（像/如), 引导方式状语从句
as
as
When you are in Rome, do as the Romans do.
His brother is ____ handsome ___ he (is).
The movie was not ______ good ____ I had expected.
Your bag is twice ____expensive____
mine
4.The driver drives faster _____ he used to (drive).
as
as
so/as
as
than
as, than, as…as, not so/as…as
as
as
as引导比较状语从句:
Thank you!