1.
To join two independent clauses, use a comma followed by a conjunction, a semicolon alone, or a semicolon followed by a sentence modifier.
 
2.
Use commas to bracket nonrestrictive phrases, which are not essential to the sentence's meaning.
 
3.
Do not use commas to bracket phrases that are essential to a sentence's meaning.
 
4.
When beginning a sentence with an introductory phrase or an introductory (dependent) clause, include a comma.
 
5.
To indicate possession, end a singular noun with an apostrophe followed by an "s". Otherwise, the noun's form seems plural.
 
6.
Use proper punctuation to integrate a quotation into a sentence. If the introductory material is an independent clause, add the quotation after a colon. If the introductory material ends in "thinks," "saying," or some other verb indicating expression, use a comma.
 
7.
Make the subject and verb agree with each other, not with a word that comes between them.
 
8.
Be sure that a pronoun, a participial phrase, or an appositive refers clearly to the proper subject.
 
9.
Use parallel construction to make a strong point and create a smooth flow.
 

10.

Use the active voice unless you specifically need to use the passive.
 
11.
Omit unnecessary words.