加上逗
号(除了所有格的名称):
1. they identified him as howard r. williams, jr., chairman of their board.
(,jr.,)
2. that is howard r. williams, jr.'s company. (,jr.'s 后面不可再加逗号)
2.2.4 在追问句之前加逗号：
1. do it, won't you? (do it 是命令语气，won't you?是追问)
2. you know the answer, don't you?
3. it is warm today, isn't it?
2.2.5 一个以副词或副词短语开头的句子，如果它和前面的句子有关联的话，必
须在有关副词或副词短语后加上逗号：
1. she believed he had the talent to succeed. unfortunately, he was lazy.
(后一个句子以副词 unfortunately 开头，同时这个句子和前一个句子有直接的
2.2.6 在句子里有超过三个并列词或短语等，在最后一个，and, or, nor等
之前加逗号：
1. he promised to supply the pencils, pens, and notebooks for the class.
(简单说就是 pencils, pens, notebooks 要写成 pencils, pens, and notebooks)
2. her mother sells tomatoes, potatoes, apples, and peaches. (...apples,
and...)
3. she ran up the stairs, across the porch, and into the ho