Some употребляется с неисчисляемыми.
A/An с исчисляемыми.
Только A перед согласным звуком.
А An перед гласным звуком.
2) We would like a lemon, please.
3) I would like a glass of milk, please.
4) We would like some rice, please.
5) We would like an orange, please.
6) I would like some bananas, please.
7) I would like an apple, please.
8) We would like some fruit, please.