三、原因状语从句

　　because/since/as区别(for)

　　1.because原因语气最强，它引导从句是说话的重心

　　如：He failed because he was too careless. 因为他太粗心，所以才失败了

　　2.since=now/seeing/considering(that)“既然”表对方已知晓的无须加以说明的原因或事实。既成事实的原因

　　如：Seeing everybody is here，let’s begin.

　　Since you ask，I will tell you.你既然问，我就告诉你

　　Seeing that it’s raining，you had better stay indoors.因为正在下雨，你最好留在室内。

　　练习：

　　1. _______ you are leaving tomorrow, we can eat dinner together tonight.

　　A. For B. Since C. Before D. While

　　3.as 往往十分明显的原因，语气较弱

　　如：As you are in poor health，you should not sit up late.既然你身体不好，你就不应该熬夜。

　　for 为并列连词, 不可在句首，表补充说明

　　如：It must have rained last night，for the ground was wet this morning.

　　not…because 句型(否定转移)“不因……而”

　　如：You should not despise him because he is poor. 不要因他穷而轻视他。

　　如：She didn’t marry you because you had money. 不是因为你有钱，她才嫁给你。

　　because/because of 区别

　　I couldn’t go to school 我因生病，所以没有去上学。

　　Because+ 从句

　　because of + N

　　四、目的状语从句

　　so…that/such…that 互换原则

　　1.单数可数名词可互换 such a nice book=so nice a book

　　例：He is so kind that everybody likes him.

　　=He is so kind a man that everybody likes him.

　　=He is such a kind man that everybody likes him. 他是如此仁慈，所以大家都喜欢他。

　　2.复数可数名词、不可数名词，只能用such…that

　　such beautiful flowers/ such cold water

　　3.名词前有many/much，few/little修饰只能用so…that

　　He earned so little money that he could barely support his family.

　　He had so many things to do that he has busy all day long.

　　练习：

　　1. She didn’t break the bad news to her mother ________ that she might break down.

　　A. so B. for fear

　　C. in order D. because

　　五、让步状语从句

　　1.Though/Although/Even if/Even though/ while he is young，he knows a lot/much.

　　=Young as/though he is，he knows a lot/much.

　　=Child as he is，he knows a lot/much.

　　=In spite of/Despite/With all/For all being a child，he knows much.

　　=He is young.but he knows a lot/much.(不与but连用)

　　2.Wh-+ever….

　　练习：

　　1. __________ I admit that the problems are difficult，I don’t agree that they can’t he solved.

　　A. Suppose B. Because

　　C. While D. Until

　　2. ________ little you may like it，old age comes to most of us.

　　A. So B. Since

　　C. However D. Despite

　　3. _______ we have finished the course, we shall start doing more revision work.

　　A. For now B. Now that C. Ever since D. By now

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