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(3)如果名词前是表示多少的many/much/few/little等词时要用so.
例如：
I have so little money that I can’t lend you any.
(4)so …that的主从复合句在转换为简单句时，可选用下列四种结构。
too…to do sth. too…for sb. to do
…enough to do sth. enough for sb. to do
例如：
Tom is so young that he can not join the army.
Tom is too young to join the army./Tom is not old enough to join the army.
The milk is so cool that we can drink it.
The milk is cool enough for us to drink.
6、比较状语从句：引导比较状语从句的连词有as…as, than等。
(1)表示甲乙在某一个方面相同时，用as+形容词/副词原级+as结构，表示甲在某一个方面不如乙时，用“not as/so+形容词/副词原级+as”结构。
例如：
John is as clever as Tom.
He does not run as/so fast as you.
(2)表示甲程度高于乙时，用“形容词、副词的比较级+than引导的”从句结构。
He is taller than I.
(3)两个比较对象要对等，即“应是句子中的同等成分进行比较”。
例如：
The weather in south is always hotter than that in north.
7、让步状语从句：引导让步状语从句的连词有though, although等。
例如：
They kept working on the farm though it was raining hard. =It was raining hard, but they kept working on the farm.
注意：though/although不能与并列连词but同时出现在一个句子中。
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