do not use periods for commas.

Enclose parenthetic expressions between commas.

A dash is a mark of separation stronger than a comma, less formal than a colon, and more relaxed than parentheses.

The number of the subject determines the number of the verb.

Exceptions are the possessives of ancient proper names ending in -es and -is,

Note that if the second clause is preceded by an adverb, such as accordingly, besides, then, therefore, or thus, and not by a conjunction, the semicolon is still required.

It usually follows an independent clause and should not separate a verb from its complement or a preposition from its object.

Two-part sentences of which the second member is introduced by as (in the sense of "because"), for, or, nor, or while (in the sense of "and at the same time") likewise require a comma before the conjunction.

"Write in a way that comes naturally," "Revise and rewrite," "Do not explain too much," and the rest; above all, the cleansing, clarion "Be clear."