第 12 课: 更多的动词：跑，跳，掷，微笑等；现在进行时-5

The girl is lying down. 那个女孩儿在躺着

The girl is running. 那个女孩儿在跑

The girl is laughing. 那个女孩儿在大笑

The girl is smiling. 那个女孩儿在笑

The birds are flying. 那些鸟在飞

The birds are swimming. 那两只鸭子在游

The birds are walking. 那两只鹅在走

The bird is flying. 那只鸟在飞