so +adj+后只能加单数么?

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

你是对的。更准确说是： so+adj.+单数可数名词=such a/an+可数名词。

so +adj +a/an +可数名词单数
so+many/much/little/few+可数名词复数/不可数名词

so+adj.+a+n.
so+adj.+n.(s)