2021-02-07《The Elements of Style

Elementary Rules of Usage:

Rule1: From the possessive singular of nouns with's

Rule2: In a series of three or more terms with a single conjunction, use a comma after each term except the last.

He opened the letter, read it, and made a note of its contents.

honest, energetic, but headstrong

Rule3: Enclose parenthetic expressions between commas

The best way to see a country, unless you are pressed for time, is to travel on foot.

Rule4: Place a comma before and or but introducing an independent clause

The early records of this city have disappeared, and the story of its first years can no longer be reconstructed.