4. 原因状语从句

　　because, as, since, now that, 和considering that, seeing that 这六个连词都用于表示表示原因, 但在语气上一个比一个弱。

　　Because --- 因为,通常从句放在主句后。

　　Mr Smith was very upset because he couldn’t find his luggage.

　　As --- 因为, 通常放在句首。

　　As he is honest and modest, all his friends like him.

　　Since ---既然 因语气较弱, 常译为既然(众所周知的原因)。

　　Since everybody has come, we can set off.

　　Now that --- 既然。

　　Now that you are here, you can join us.

　　considering that --- 顾及到。

　　Considering that they are just beginners, they are doing quite a good job.

　　seeing that --- 由于。

　　Seeing (that) quite a few people were absent, we decided to put the meeting off.

　　5. 结果状语从句

　　引导结果状语从句的连词有：that, so that, so…that…

　　such…that So… that --- 太……以至于 so 后面应用形容词或副词, 有时省略so只用that。

　　Boeing 747 is so large that people like to call it jet bomb喷气炸弹.

　　So that --- 因而，以便，为了 有时so 可以省去。

　　Speak louder please so that the people at the back can hear you.

　　Such …that… ---太……以至于 用法与so…that相同，但such 后面应用名词。

　　The foreign visitor was such a fast speaker that nobody could understand him.

　　6. 目的状语从句

　　引导目的状语从句的主要连词有: that, so that, in order that, for fear that, lest.

　　(So) that --- 以便, 从句中常常使用一些情态动词，如：can, could, may, might, should等。

　　Let’s take the front seats (so) that we may see more clearly.

　　in order that --- 为了, 与so that 相同从句中常常使用一些情态动词，如：can, could, may, might, should等。

　　School was closed early in order that the children might go home ahead of the storm.

　　for fear that --- 生怕; 为了防止(某事发生)。

　　He took the name down for fear that he should forget it.

　　in case --- 万一。

　　You should bring a dictionary in case you need it.

　　Lest --- 以防万一。

　　The man decided to tell his boss the fact lest he would be angry with him.