1.so +adj +a/an +可数名词单数
He is so clever a boy.
2so+many//few+可数名词复数
There are so many people at the meeting that i can't find my father easily.
He has so few friends to visit
3,so+much//little +不可数名词
There is so much water in the jar
He has so little money that he can't pay for the bike