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  　　　2.because,as,since 的区别：

　　　　because用于表示直接原因,回答why提出的问题，语气最强;As用于说明原因, 着重点在主句，常译成"由于";since表示显然的或已知的理由或事实，常译成"既然"。如：

　　　　Water is very important because we can't live without it.

　　　　He didn't come yesterday as his mother was ill.

　　　　I'll do it for you since you are busy.

　　　　3.such…that, so…that, so that 引导结果状语从句的区别：

　　　　such是形容词，修饰名词; so 是副词，修饰形容词或副词。其结构如下：

　　　　1) such + a (n)+ 形容词+单数可数名词+that……

　　　　2) such+形容词+复数可数名词+that ……

　　　　3) such +形容词+不可数名词+that……。如：

　　　　This was such a good film that I went to see it several times.

　　　　It was such good books that they sell well.