n.凸边；沟
the woman is going to buy it. the man is going to write. the girl is going to eat the food. i am going to chimb the leader. i am wrinting. he is eating. 用肯定特征和否定特征分别描述六个人要做什么，以及他们正在做什么： 一个女人、一个男人、一个女孩、一个男孩、你和我。例如：那个男人要买一辆轿车。那个女人正在买花。
