以“辅音字母+y”的名词，把y变i再加es，如fly—flies，family—families，baby—babies，city——cities，enemy-enemies。
Waiter, there\'s a fly in my soup! That\'s OK, Sir, there\'s no extra charge!
服务员，汤里有只苍蝇！我知道，先生，我们没有另收钱。
There are five people in my family.
我家里有五口人。
She gave birth to a fine healthy baby.
她生了一个健康漂亮的婴儿。
