第 5 课: 数词和量词及名词的单复数-4

A man is dancing. 一个男人在跳舞

Men are dancing. 男人们在跳舞

A woman is singing. 一个女人在唱歌

Women are singing. 女人们在唱歌

a boy on a bicycle 一个骑自行车的男孩儿

men on bicycles 骑自行车的男人们

A bird is flying. 一只鸟在飞

Birds are flying. 一群鸟在飞