导的从句中的谓语带有may，might，should等情态动词 Take your umbrella in case it rains. 带上你的伞，以防下雨。 He took an umbrella with him for fear that it might rain. 他带了一把伞，以防下雨。 1. 结果状语从句
(1) so that引导的结果状语从句
① so that引导的结果状语从句只能位于主句之后，so that”引导什么从句根据句意来判断 Suddenly it began to rain heavily，so that it was almost impossible to carry on driving. 突然下起了大雨，几乎无法继续开车。
Linda phoned me in on arrival so that I know she was safe and sound.
琳达到达后给我打了电话，因而我知道她平安无事。 (2) so...that引导的结果状语从句
so...that“如此??以致”，that可以省略，so后面接形容词或副词。如：
She spoke so fast that nobody could catch what she was saying.
她说话如此之快竟没有人听出来她在讲什么。
There is so little time left that I have to tell you about it latter.
现在剩下的时间不多了，我只好以后再给你讲这件事。
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(3) such...that引导的结果状语从句
引导结果状语从句的such...that的具体内容是：such+a/an+形容词+名词+that从句。such+a/an+形容词+单数名词+that=so+形容词+a/an+单数名词+that从句。
The professor told us such a funny story that all the students laughed．
(＝The professor told us so funny a story that all the students laughed.)
教授讲了个很有趣的故事，(以致于)所有的学生都笑了起来。
2. 条件状语从句 (1) if引导的条件状语从句 If引导条件状语从句。翻译成“如果”
If I were a bird ,I would fly. 如果他说了那样的话，他不可能是说实话。
(2) unless引导的条件状语从句
unless引导的是否定条件状语从句，在意义上相当于if...not，而且语气较强，一般不用于虚拟语气。如： You’ll be late unless you hurry. 你会迟到的，如果不赶快的话。
(3) if only引导的条件状语从句
if only在引导条件状语从句时意为“只要；如果”。如: I’ll let you use the car if only you keep it in good condition.
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只要你把车保养好，我就让你用。 (4) as/so long as引导的条件状语从句 as/so long as意为“只要；如果”。如：
As long as it doesn’t rain, we can play. 只要不下雨我们就能玩。
(5) provided (that)/providing (that)引导的条件状语从句 provided (that)/providing (that)意为“如果；只要”。如： I will agree to go providing (that my expense are paid.) 假如为我负担费用，我就同意去。 3. 让步状语从句
(1) although/though引导的让步状语从句
although和though，都作“虽然；尽管”解，通常可以换用， Although they have been talking for a long time, he cannot make her believe him.
虽然和她谈了半天，他还是不能让她信任自己。 (2) even if引导的让步状语从句
even if “即使，纵然”，从句表示的是尚未发生的动作或存在的情况。如：
Even if I failed again, I will not give up the experiment. 即使我再次失败，我也决不会放?%f
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