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可以用于下列结构，但是形式上要注意：so+adj.+a(n)+n.相当于 such+a(n)+adj.+n.。
5.so that 可以引导目的的状语从句，也可引导结果状语从句。表示目的时，是“为了、以便”的意思。so that常为in order that所代替，从句中通常有：may，will，can，should这类情态动词。口语中常省略that，书面语中常省略so。如：
I went the lecture early so that I got a good seat.
The teacher spoke through a microphone so that students in every classroom can hear him. The teacher spoke through a microphone so that students in every classroom can hear him.
6.though，although 的意思是“虽然”“尽管”，even if(though)的意思是“即 使”“纵然”。它们都可引导一个让步状语从句though，although及even if(though)不能和but连用，如：
We’ll try to finish the work in time though there are some difficulties. Even if father were to object,we would not change our minds.
引导名词性从句的连词主要有that，whether，if，wh-等。that本身无词义，“是否”。
whether 和 if 都表示
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