2.2.7 在句子中加上逗号，以免引起误解：
1. that she knew where the money was, was news to me. (如果was, was 之间
不加逗号，是不是会引起误解呢？)
2. outside, the lawn was cluttered with hundreds of broken branches.
外面的草坪上到处是断枝。
(如果outside 后去掉逗号, 那意思就变成“在草坪的外面到处是断枝。”)
2.2.8 用逗号分开引用句：
1. “you are beautiful,” he said. (这个逗号要放在引号内)
2. our teacher said, “freedom is not license.” (...said,)
3. “no,” she said, “i was just testing your patience.” (no, /
....said,)
4. “perhaps,”tom responded, “i will try anyway.” (perhaps, /
responded,)
2.2.9 逗号用以分开星期、月日、年份：
1. on monday, may 5,2000, her first child was born. (monday, may 5,
2000, )
2. on march 8, 2003, he bought a new car. (march 8, 2003, )
3. june 2000 is one of the most meaningful of my life