【正文】
dog. I have a pen. You have a pen. You have pens. We have pens. They have pens. He has a pen. She has a pen. It has a tail. 否 定 式 I don’t know it. You don’t know it. We don’t know it. They don’t know it. He doesn’t know it. She doesn’t know it. It doesn’t run. I am not a student. You are not my teacher. You are not teachers. We are not sisters. They are not brothers. He is not Tom. She is not Alice. It is not a dog. I don’t have a pen. You don’t have a pen. You don’t have pens. We don’t have pens. They don’t have pens. He doesn’t have a pen. She doesn’t have a pen. It doesn’t have a tail. 疑 問(wèn) 式 Do you know it? Do they know it? Does he know it? Does she know it? Does it