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目的状语从句★★★★
目的状语从句：从句部分是用以补充说明主句中谓语动词发生的目的的。
1. 引导目的状语从句常用的连词有： that（以便），so that（以便）引导的从句只能置于主句的后面， in order that（为了；以便）引导的从句还可以置于句首；从句的谓语常含有may might can could should would等情态动词。
2. Lest（免得；唯恐）， for fear that（生怕；以免）；in case引导的目的状语：lest引导的从句一般要用“should+v原”，should也可以省略。In case引导的从句一般要用虚拟语气，也可用陈述语气。它们都有“以防，以免”之意。
You must
speak louder so that /in order that you can be heard by all.你必须大点声说好让大家都听到。
He wrote the
name down for fear that(lest) he should forget it. 他把名字写下来以免忘记。
Better take
more clothes in case the weather is cold. 最好多穿点衣服以防天冷。
Please
remind me of it again tomorrow in case I forget.
Say it
louder(so)that everyone can hear you. 大声说，以便大家都能听到你。
I am telling
you that lest you should make a mistake. 我告诉你这一点，以免你搞错。
People
evacuated (撤离)the building lest
the wall should collapse.人们从大楼中撤离唯恐墙体坍塌。
3. 在口语中so可以引导目的状语从句。
We'll sit
nearer the front so we can hear better. 我们坐的靠前一点，那样我们能听得清楚一点。
4.【注意】in order that与in order to的区别：
in order
that+从句 /in order to+动词原形 （ in order to后面加的那个不叫目的状语从句，叫目的状语）
★★★★第九讲：比较状语从句★★★★
比较状语从句经常用于形容词（+名词）和副词的比较：
1. …as 副词/形容词（+名词）as …用于同级比较，句中第一个as是副词，修饰形容词或副词，第二个as是连词，引导一个有省略成分的比较状语从句。
This book is
as interesting as the one you ‘re reading.这本书和你正在读的那本一样有趣。
He is small
and weak but he works as hard as everyone else. 他体弱，矮小，但和其他人一样努力工作。
He is as
naughty a boy as Tom Sawyor. 他是一个像汤姆。索耶一样淘气的孩子。
用于否定句时，副词也可以用so:
His brother
does not work as/so hard as he does. 他弟弟不像他那么努力工作。
“…as…as…”句型常用于一些比较固定的句型：
The girl is
as happy as happy can be. 这姑娘高兴极了。
The boy
works as hard as ever/ before. 这小伙子一如既往地努力工作。
I will give
you my research result as soon as possible. 我会尽快把我的研究成果给你。
Ali was as
great a boxer as any. 阿里是个非常杰出的拳击手。
表示倍数时要使用统计比较句：
The film was
not half as interesting as we had expected. 电影还没有我们料想的一半好。
I spent
twice as much time as you did finishing my work. 我完成工作花去了两倍于你所用的时间。
也可以用“as many/ much again”表示一倍：
We have
collected some money but we need as much again. 我们已集了一些资，但我们需要两个这么多。
They have
found five chairs but we need as many again. 他们找到了5把椅子，但我们需要10把。
2.
“…more/less (形容词/副词)… than…”句型用于优级或劣级比较。Than 是连词，引导有省略的比较状语从句。
It is more
expensive but less time-consuming to travel by plane than by train. 乘飞机旅行比乘火车旅行费钱，但省时。
Although he
has lived in the States for 30 years he is more Chinese than American.他虽然已在美国生活了30多年，可还是更具有中国味儿。
He spends
more (money) than he earns. 他花的钱比挣的还多。
在同类人、事物中进行比较时，应把自己从比较对象中排除：
Mary is
taller than any other girl in her class. 玛丽比班上的其他女孩子都要高。
Mary is
taller than anyone else in her class. 玛丽比班上任何同学都要高。
同级比较和优/劣级比较混用时，应注意比较句型的完整性：
This book is
as interesting as if not more than that one. 这本书如果不比那本书有趣，也是一样有趣。
3. “the
more(形容词/副词)…，the more(形容词/副词)…，”递进比较句。前句为比较状语从句，后句为主句。句中“the”是副词，修饰比较级的形容词或副词，表示“愈加”的意思。
The more I
read the book the more interested I get in it. 这本书我愈看愈爱看。
这个句型经常发生省略，从句和主句省略应平衡。
The sooner
the better. 愈快愈好。
The more
haste the less speed. 欲速则不达。
注意：使用状语从句时要注意的几个问题
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