Passive-voice sentences that omit the actor are always shorter and tidier than their active-voice counterparts. Hooray!
If the actor needs to be specified, then, for crying out loud, put it in.
After that, I don't really care if you use the active voice or not. Just make it good.
This article satisfies Squid Commo Objective #3: Clarify and simplify the rules.
The rule "use the active voice" and its slightly more indulgent sibling "prefer the active voice" are monkeys on the backs of business and military writers, two professions where grammar bullies skulk and scupper in abundance. I was even told at an Army school I attended that a former Chief of Staff of the Army actually tried outlawing the use of passive voice entirely.
The trouble is that, even though passive-voice-infested bureaucratese is one of the most hideous forms of communication, the passive voice is not always wrong. In fact, it's often the better choice, and (surprise!) in some cases the passive voice is the only way to say something and have it make sense.
The solution to bad writing isn't to avoid the passive voice. What we really want to avoid are clumsy, vague, wordy, and otherwise poorly written sentences. Sometimes that means preferring the passive voice.
Briefly, passive voice happens when an actor has passed an action on to a receiver. But the sentence describing it uses the receiver as the subject, not the actor. This is accomplished by employing a be verb with the past tense of the verb describing the action. We call this verb form a past participle.
For example, here are some Squid Approved! passive-voice sentences that I think are just fine.
1. Smith was elected mayor.
Be Verb: was
Past Participle: elected
2. Your dad was taken to intensive care an hour ago.
Be Verb: was
Past Participle: taken
3. Lincoln was born in a log cabin.
Be Verb: was
Past Participle: born
4. I am relieved to see that you made it home safely.
Be Verb: am
Past Participle: relieved
5. I am related to Barb.
Be Verb: am
Past Participle: related
6. Bill is being laid off.
Be Verb: is being
Past Participle: laid off
Now consider the active-voice counterparts to the Squid Approved! sentences above, with the actor inserted as the subject.
Active-Voice Version
1. The voters elected Smith mayor.
Well, duh. Do we really need to be told that voters did the electing?
2. The orderlies took your dad to intensive care an hour ago.
I don't care who moved him. The orderlies are irrelevant, so it's okay to leave them out.
3. Lincoln's mother bore him in a log cabin.
Who talks like this? Too archaic. Too obvious.
4. Seeing that you made it home safely relieves me.
This can't be said without repeating and explaining yourself. Too obscure.
5. Marriage relates me to Barb.
Oh, yeah, I'll win friends and influence people talking like this. Too weird.
6. The evil, omnipotent "they" are laying off Bill.
Actually, I could go either way on this one. Both passive and active look good to me.
As you can see, active voice didn't improve a thing. And farthermore, it is not true that active voice is inherently less wordy and less clumsy. But notice what all six sentences have in common: Including the actors was completely unnecessary.
Now brace yourselves.
All past participles of transitive verbs* fundamentally qualify as adjectives. So passive-voice sentences like those above are equivalent to saying "You are ugly" or "I am handsome." They stand up all by themselves just fine and are always (always!) shorter and cleaner than their active-voice counter parts.
Passive Voice 1, Active Voice 0.
Now do you get it? The culprit in all this is the actor. And therein lies the bottom-line basis for regulating the use of passive voice.
In the end, what makes passive voice potentially evil is its use in situations where the actor needs to be identified. I can think of two general cases—one that definitely needs correcting and one that might.
Case 1. The actor needs to be identified but is left out altogether. This is what Army Chiefs of Staff get all riled up over.**
"Hill 238 will be cleared of enemy and occupied by 1800 hours."
This fails to specify exactly who will be doing the clearing and who will be doing the occupying. It's not a PUG issue, though. It's a personnel issue. Get you some smarter people.
Case 2. The actor needs to be identified, but it's included as the object of the sentence.
"John was bitten by Mrs. Harris's dog."
This might be okay. It's wordier and, I think, clumsier than the active counterpart, "Mrs. Harris's dog bit John." But it's a matter of emphasis. Perhaps we're emphasizing John, because John might need our sympathy right now.
Or, if you're like me and hate Mrs. Harris's dog, you might want to emphasize that little abomination's role in John's misfortune. That would call for the active voice.
Additionally, a rule prohibiting Case 2 passive constructions would require exceptions. For example, the red flag goes up with "Bill was smitten by Barb." But the active-voice counterpart, "Barb smote Bill," is of no help, since it changes the meaning.***
Don't care. I would approach situations where the actor does not need to be identified with extreme insouciance. As far as I'm concerned, it's a be verb and an adjective. Let that dog lie in peace.
Care. I would go after Case 1 situations with extreme prejudice and, in the spirit of reparation, may prefer the active voice. Maybe.
Don't care. I would leave Case 2 situations in the hands of a competent writer. That is, I see nothing wrong with something like, "I am intrigued by your fear of the passive voice."
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* Transitive verbs are verbs that have an actor and a receiver. Their past tense fossilizes actions into conditions, i.e., verbs into adjectives. So if something tires (transitive verb) you, you enter a state of being tired (past participle = adjective).** You really expect me to say, "This is up over which Army Chiefs of Staff get all riled"? Pfft.*** Hey, you need exceptions. They're nature's reminders that rules are lousy substitutes for understanding.