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九年级上册 Unit 4
2024贵州英语
(课标版)
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回归教材 知识梳理
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回归教材 知识梳理
辨析as soon as与as long as
知识点1
This method worked well at night as long as the weather was good and the stars could be seen.只要天气好,能看见星星,这个方法在晚上就奏效。(Unit 4 P87)
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词组 含义 用法 例句
as soon
as 一……
就…… 引导时间状语从句,时态遵循“主将从现”原则,即主句是一般将来时,从句常用一般现在时。也遵循“主过从过”原则,即主句和从句都用过去时。 I will call you as soon as I get there.
我一到那里就给你打电话。
He got married as soon as he graduated.他一毕业就结婚了。
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词组 含义 用法 例句
as soon
as 尽快,
尽早 侧重于“极短时间内”,常构成as soon as possible或as soon as sb.can,在句中作状语。 I’ll finish the work as soon as possible/I can.我将尽快地完成工作。
as long
as 只要 引导条件状语从句,相当于so long as。时态遵循“主将从现”原则。 You may use my dictionary as/so long as you don’t keep it too long.只要使用时间不太长,你可以用我的词典。
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词组 含义 用法 例句
as long
as 和……
一样长 用于同级比较的句型中。 This ruler is as long as that one.
这把尺子和那把一样长。
长达……
之久 for as long as+一段时间 I have lived here for as long as 10 years.我已经在这儿住了长达10年之久。
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1.Mr.Black will go home as soon as he finishes (finish) his work.
2.只要他明天来,我就告诉他这个好消息。(补全译文)
As long as he comes tomorrow,I will tell him the good news.
finishes
As
long
as
comes
as long as as soon as
3. As soon as I walked into the room,I knew something was wrong.
4.We can achieve our dream as long as we don’t give up hope in the face of difficulties.
As soon as
as long as
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It is(has been)+时间段+since从句
知识点2
It has been two days since we landed on Mars.我们登上火星已经两天了。(Unit 4 P94)
“It is(has been)+时间段+since从句”与“时间段+has passed+since 从句”可以互换,表示“自从……以来已经有多长时间了”。since后面的从句多用短暂性动词,通常用一般过去时。这两种句型可与相应的一般过去时态的句子进行转换。此外,部分短暂性动词可转化为相应的延续性动词或表状态的be+名词/形容词/副词/介词短语等,与这两种句型构成同义句。如:
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“他死了两年了。”有如下表达方式:
①It is(has been) two years since he died.
②Two years has passed since he died.
③He died two years ago.
④He has been dead for two years/since two years ago.
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1.It has been (be) 10 years since the park was built (build).
2.我到这儿已经一周了。(补全译文)
It has been a week since I arrived here.
been
built
It
since
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warn的用法
知识点3
One scientist warns that if robots start to think for themselves,they will no longer want to be our servants,but our masters.一名科学家警告说,如果机器人开始独立思考,它们就不再想做我们的仆人,而是做我们的主人。(Unit 4 P103)
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1.Our headmaster warns us not to break (break) the school rules,or we’ll be punished.
2.The police have warned tourists against leaving (leave) the main tourist centers.
3.Some animals’ strange acts can warn people of/about danger.
4.Miss Wang often warns (告诫) us not to make friends with strangers online.
to break
leaving
of/about
warns
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本讲内容结束
请完成《练测本》P31~P32
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