> Remember to [preserve the full] infinitive.
> [Always use] the [active] voice.
> [Always] put statements in the [positive] form.
> Verbs have to agree with their subjects. (nobody9999 corrected this one already - was "has" in place of "have")
> Proofread carefully to see if you [leave] words out.
For those not in on the joke. Not sure if this would be how Safire would correct it, but I made an effort.