第 2 课: 动词：走，跳舞，游泳，摔倒等；现在进行时-4

The man is running after the boy. 那个男人在追那个男孩儿

The man is falling. 那个男人正摔下来

The boy is falling. 那个男孩儿正摔下来

The girls are running after the boy. 那两个女孩儿在追那个男孩儿

The airplane is flying. 那架飞机在飞

The man is running. 那个男人在跑

The man is jumping. 那个男人在跳

The man is falling. 那个男人正摔下来