第 5 课: 数词和量词及名词的单复数-3

a baby 一个婴儿

babies 两个婴儿

an egg 一个鸡蛋

eggs 几个鸡蛋

A boy is jumping. 一个男孩儿在跳

Boys are jumping. 男孩儿们在跳

A girl is running. 一个女孩儿在跑

Girls are running. 女孩儿们在跑