写出下列名词的复数形式和动词过去式knife sheep shelf bus box city give make is
问题描述：
写出下列名词的复数形式和动词过去式
knife sheep shelf bus box city give make is
答
knife→knives sheep 的单复数形式一致 shelf→shelves bus→buses city→cities
give→gave make→made is→was
答
复数：knives,sheep,shelves,buses,boxes,cities,
动词过去式：gave,made,was