No sentence fragments.
Avoid run-on sentences they are difficult to read.
A writer must not shift your point of view.
Reserve the apostrophe for it’s proper use and omit it when its not needed.
Write all adverbial forms correct.
Don’t use no double negatives.
Also, avoid awkward or affected alliteration.
Avoid commas, that are not necessary.
Verbs has to agree with their subjects.
And don’t start a sentence with a conjunction.
The passive voice should never be used.
Never use a long word when a diminutive one will do.
Always proofread carefully to see if you any words out.
Use parallel structure when you write and in speaking.
Never, ever use repetitive redundancies.
Last but not least, avoid clichés like the plague.
~ William Safire’s Fumblerules: A Lighthearted Guide to Grammar and Good Usage.