(3) 看下面的词组，你能知道什么时候用a, 什么时候用an吗?

A. a shirt, a pair of trousers, a bottle of milk, a Chinese boy,

a map of the UK;

B. an egg, an orange, an apple, an American boy, an ugly man,

an ambulance man

为什么下面的句子中的honest前用an而不用a?

He’s an honest boy.

(4) 读下面的句子，总结什么时候用some, 什么时候用any。

A. I have some fish. I can see some birds.

   B. Do you have any white skirt? Are there any shoes under the bed?