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2) 掌握unless, as soon as, so…that的用法，以及时间状语从句和条件状语从句在事态上的特殊用法。。
三、教学过程
Step 1 lead-in
1. Present 9 sentences, then ask the students divide them into three groups.
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.
tips: unless, as soon as, so…that
Students give the answer and the reason
2. Check the answer. (见课件)
Step 2 Grammar
1. unless是连词，意为“除非；如果不”，引导条件状语从句，含有否定意义，相
当于if ... not 。
You’ll fail in English unless you work hard.
We’ll miss the bus unless we walk more quickly.
2. as soon as是连词词组，引导时间状语从句，意为“一……就……”。
As soon as I have finished, I’ll give you a call.
I’ll write to you as soon as I get to Beijing.
so ... that表示“如此……以至于……”，常用于引导结果状语从句。
1). so＋形容词或副词＋that ...引导肯定的结果状语从句，意思是“如此……以至于……”。
The sunshine is so nice that I want to go swimming.
2). so＋形容词或副词＋that ...引导否定的结果状语从句，意思是“如此……以至于不能……”。
The camera is so expensive that I can't afford it.
Step 3 Special points