ELEMENTARY RULES OF USAGE

1.From the possessive singular of nouns by adding’s.

• 直接加's构造所有格，也不用管最后的辅音 >Charles’s friend
  Burns’s poems
  the witch’s malice
• 例外：古代的专有名词的所有格(不包括Jesus’) > Moses’Laws—->the laws of Moses
• 不定代词(indefinite pronouns)同样加's构造
• 不要混淆its和it's

2.In a series of three or more terms with a single conjunction,use a comma after each term except the last.

• 连续的几个词，除了最后一个词，前面的都要加, >Thus write red,white,and blue
  gold,silver,or copper
  He opened the letter,read it,and made a note of its contents.
• 作为公司名，倒数第二个单词后面的,也要省略 >Little,Brown and Company
  Donaldson,Lufkin & Jenrette

3.Enclose parenthetic expressions between commas.

• 在两个,之间放置插入语
• 如果插入语不怎么影响句子流，则两个,可以省略，但是绝对不要省略一个，而留下另一个
• 日期经常含有插入语 >February to july,1992
  April 6,1986
  Wednesday,November 14,1990

• 比较好的写法是用单词分割数字而不用, >6 April 1988

• 呼语(direct address)中的名字和头衔，是插入语 > If,Sir,you refuse,I cannot predict what will happen. > Well,Susan,this is a fine mess you are in.

• etc.,ie.,and e.g.和名字后面的学位缩写，头衔缩写