【正文】
ndfather. Those are his … grandparent . S (grandparent) (grandparent) This is his … friend. (朋友) These are his … friends. (朋友們) That is his parent. Those are his parents. Those are his grandparents. That is his grandparent. This is his friend. These are his friends. is these those that this are 復(fù)數(shù)