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2. I will tell him the news as soon as he comes back.
3. The teacher speaks so fast that I can't catch the words.
4. I’ll write to you as soon as I get to Beijing.
5. She will miss the train unless she gets up early.
6. He took out his English books as soon as he sat down.
7. The camera is so expensive that I can't afford it.
8.I won't let you in unless you show me your passport.
9. The sunshine is so nice that I want to go swimming.
仔细观察下面的状语从句，体会连词的用法。
【语境领悟】
1.You will fail the exam unless you prepare for it.
2. I will tell him the news as soon as he comes back.
3. The teacher speaks so fast that I can't catch the words.
4. I’ll write to you as soon as I get to Beijing.
5. She will miss the train unless she gets up early.
6. He took out his English books as soon as he sat down.
7. The camera is so expensive that I can't afford it.
8.I won't let you in unless you show me your passport.
9. The sunshine is so nice that I want to go swimming.
【知识构建】
(一)定义
状语从句由从属连词引导, 从属连词不充当句子成分, 只起连接作用。状语从句在复合句中修饰主句中的谓语、形容词或副词, 根据意义上的不同, 可分为: 条件状语从句、时间状语从句、结果状语从句等。
unless
unless引导条件状语从句，意为“除非，如果不”。unless = if... not。
You’ll fail in English unless you work hard.
You’ll fail in English if you don't work hard.
（二）常见用法
as soon as
as soon as是连词词组，引导时间状语从句，意为“一……就……”。
如：