1.We are having such beautiful weather that I do not feel like going to class.beautiful 不是形容词吗,为什么用such?
答：so 确实修饰形容词或者副词,such修饰名词,但是这里such是修饰weather的,并不是修饰beautiful,beautiful也是用来修饰weather的.
2.The classroom has such comfortable chairs that the students find it easy to fall asleep.同样comfortable 不是形容词吗?
答：分析与上相同.
3.There were so few people at the meeting that it was cancelled.
答：so在此修饰形容词few,few表示“很少的,几乎没有的”.
4.There was such little traffic that it took us only ten minutes to get there.这两个句子为什么一个用so一个用such呢?
答：little在此表示“小的”,修饰名词traffic,such是用来修饰traffic的,并不是修饰little的.
祝您学习进步,更上一层楼!O(∩_∩)O