文档介绍：Unit6 单元知识小结与短语归纳
一、语法
1. unless是连词，意为“除非；如果不”，引导条件状语从句，含有否定意义，相当于if ... not 。
注意：unless引导条件状语从句时，如果主句是一般将来时，从句用一般现在时表将来，即时态遵循“主将从现；主过从过”原则。
如：We’ll go to the concert unless it rains. = We’ll go to the concert unless it doesn’t rain.
2. as soon as是连词词组，引导时间状语从句，意为“一……就……”。as soon as引导的时间状语从句中，若主句是一般将来时，从句用一般现在时表将来，即时态遵循“主将从现；主过从过”的原则。
如： My brother will look for a job as soon as he leaves school.
3. so (such) ... that…表示“如此……以至于……”，常用于引导结果状语从句。常见结构为“so +形容词/副词+ that从句”或“so +形容词+ a / an +单数名词+ that从句”。
如: He was so excited that he couldn’t say a word.
注意：该句子中so修饰形容词不能换为such, so修饰副词时也不能换为such .
It is so interesting a book that many people want to buy it.
=It is such an interesting book that many people want to buy it.
4. a little bit (= a little) + 形容词或副词或比较级时，表示“一点儿”。
a bit of + 不可数名词 ，一点 ……
5. instead of 是复合介词，后接名词、代词、动词的-ing形式或介词短语等，意为“代替，作为……的替换”。 instead与instead of 只有一词之差，但在用法上区别很大。instead是副词，意为“代替”，在句中只能用作状语。
The doctors went to Shanghai by train instead of by car. 
I gave her some advice instead of money.
We have no coffee. Would you like some water instead?
Donna never studies. Instead, she plays table tennis all day.
二、短语
1. can (同义词) be able to
2. if… not (同义词) _unless
3. named (同义词) _called
4. 会72变化 (汉译英) make 72 changes
5. 将……变成 (汉译英) _turn… into
6. 如此……以至于(汉译英) so… that
7. 一……就 (汉译英) __as soon as
8. 将某物据为已有ke