There are plenty of trees where I live.
Wherever I am I will be thinking of you.
通常由as,(just)as…so…,as if,as though引导。
Always do to the others as you would be done by.
As water is to fish,so air is to man.
Just as we sweep our rooms,so we should sweep backward ideas from our minds.
2）as if,as though
They completely ignore these facts as if(as though)they never existed.
He looks as if(as though)he had been hit by lighting.
It looks as if the weather may pick up very soon.
说明：as if/as though也可以引导一个分词短语、不定式短语或无动词短语，例如：
He stared at me as if seeing me for first time.
He cleared his throat as if to say something.
The waves dashed on the rocks as if in anger.
I didn't go,because I was afraid.
Since/As the weather is so bad,we have to delay our journey.
He is absent today,because/for he is ill.
He must be ill,for he is absent today.
可以由that,so that,in order that,lest,for fear that,in case等词引导
You must speak louder so that/in order that you can be heard by all.
He wrote the name down for fear that(lest)he should forget it.
Better take more clothes in case the weather is cold.
so foolish such a fool
so nice a flower such a nice flower
so many/few flowers such nice flowers
so much/little money.such rapid progress
so many people such a lot of people
（so many已成固定搭配，a lot of虽相当于many，但a lot of为名词性的，只能用such搭配。）
The boy is so young that he can't go to school.
He is such a young boy that he can't go to school
连接词主要有if,unless,as/so long as,on condition that等。.
Let's go out for a walk unless you are too tired.
If you are not too tied,let's go out for a walk.
Although it's raining,they are still working in the field.
Though the sore be healed,yet a scar may remain.
Child as/though he was,he knew what was the right thing to do.
=Though he was a small child,he knew what was the right thing to do.
Try hard as he will,he never seems able to do the work satisfactorily.
=Though he tries hard,he never seems…
3)ever if,even though.
We'll make a trip even though the weather is bad.
Whether you believe it or not,it is true.
No matter what happened,he would not mind.
Whatever happened,he would not mind.
（错）No matter what you say is of no use now.
（对）Whatever you say is of no use now.
（错）Prisoners have to eat no matter what they're given,
（对）Prisoners have to eat whatever they're given.
hardly/scarcely…when/before,no sooner…than和as soon as都可以表示"一…就…"的意思，例：
I had hardly/scarcely got home when it began to rain.
I had no sooner got home than it began to rain.
As soon as I got home,it began to rain.
Hardly/Scarcely had I got home when it began to rain.
No sooner had I got home than it began to rain.
1）___she is young,she knows quite a lot.
A.When B.However C.Although D.Unless
解析：答案：C。意为虽然她很年轻，却知道许多，although引导让步状语从句，此题容易错选B,因为However young she is,she knows quite a lot与此句意思一样。
2）You will be late ___ you leave immediately.
A.unless B.until C.if D.or
解析：答案A。句意：除非你立即走，否则你就会迟到的。可转化为If you don’t leave immediately,you will be late.B、D句意不对，or表转折，句子如为You leave immediately ____ you will be late，可选D.
3)Generally speaking,_____ according to the directions,the drug has no side effect.
A.when taken B when taking C.when to be taken D.when to take
解析：错选C.本题考查状语从句的省略。完整句子应为“when it is taken according to the directions,…..”。时间状语从句不用将来时（含表将来的结构），所以C选项错。正确答案为A。
4）________,she knows a lot about football teams.
A.House wife as she is B.A house wife as she is
C.As she is a house wife D.As a house wife