so that 和such that

so that 和such that
I have met so many people in the last few days that I can’t remember all of their names.
There were so few people at the meeting that it was cancelled.
I have so much trouble that I need your help.
这些地方都用的so,so后面不是接形容词和副词么?为什么不是用such?
The classroom has such comfortable chairs that the students find it easy to fall asleep.
There was such little traffic that it took us only ten minutes to get there.
这里怎么就是用的such呢？这里的第二句such后面的名词也是有little修饰的，这里怎么还是可以用such呢？
many much little few表示数量的时候前面用so 还有一些特别的例子就要用such