so +adj +a/an +可数名词单数

例句：He is so clever a boy

It's so interesting a book that I have read it many times.它是一本如此有趣的书,以至于我读了很多遍了.

It's so heavy a box that I can't carry it .它是一个如此重的箱子以至于我搬不动它.

so+many/few+可数名词复数

例句：There are so many people at the meeting that i can't find my father easily.