连词:so that,in order that,for fear that(以免),in case(以免)等。
eg:Speak clearly so that they may understand you.
He spoke slowly in order that everyone should understand.
I've got the key in case we want to go inside.
eg:It's such a good chance that we can't miss it.
He was so angry that he could not speak.
Everybody lent a hand so that the work was finished ahead of time.
连词:as(正如)，as if=as though(似乎、好像)
eg:He looks as if he's tired.
I did just as you told me.
eg: I can walk faster than you can run.
He spent twice as much time on this picture as on that one.
He woke up as suddenly as he had fallen asleep.