第 2 课: 动词：走，跳舞，游泳，摔倒等；现在进行时-5

The woman is swimming. 那个女人在游泳

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 boy is swimming. 那个男孩儿在游泳

The fish is swimming. 那条鱼在游

The bird is flying. 那只鸟在飞

The bull is running. 那头牛在跑

The bird is swimming. 那只鹅在游