A
I can't belive (such) little birds can eat(so) much food in (such) a short time.
such 修饰名词
so 修饰形容词或副词
such little birds 修饰的是 birds,小鸟,名词,所以such
so much food 修饰的是much 形容词,所以用so
such a short time 修饰的是time ,名词,所以such.
我不敢相信这些小鸟在这么短的时间内吃了这么多的食物.
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