1.公式001a+单数量词+of+复数可数名词● a basket of eggs一篮子鸡蛋● a group of children一群孩子

2.公式002数词+复数量词+of+复数可数名词● two boxes of pens 两盒钢笔● two baskets of apples两篮子苹果

3.公式003a+单数量词+of+不可数名词● a piece of chalk 一支粉笔● a bit of bread一点面包