On her Grammar Girl podcast this week, Mignon Fogarty is running a guest script that I wrote on the just because X doesn’t mean Y construction, a thriving piece of English syntax that has come into its own in the last 50 years or so. My favorite example of JBX-DMY is
Just because you’re paranoid doesn’t mean they’re not out to get you.
In this post, I go into some of the details that didn’t make it into the script. First off, quite a bit has been written about this construction; the sources I read while writing the Grammar Girl script are:
JBX-DMY is so common that it’s easy to overlook that it doesn’t follow the regular syntactic or semantic rules. On the syntactic side, what’s the subject of doesn’t mean? Is it the just because clause? Or is it an understood subject that sometimes gets pronounced, as in Just because it’s easier to raise VC money, that doesn’t mean you should, or Just because it’s wrong, it doesn’t mean it’s not funny?
Weird semanticsFor comparison, let’s look at more regular sentences that contain just because. For example, think about the scope of the “cause” meaning and the negation meaning in Bill isn’t speaking to me, just because I served him a cat-food sandwich as a joke. Depending on the intonation, we can get two readings. I’ll illustrate them by using the notation CAUSE(A)(B) to mean that A caused B. With the intonation suggested by the comma I put in the sentence, we get this reading, with CAUSE taking scope over the negation:
CAUSE(serve cat-food sandwich)(NOT(speaking to me))
(i.e. my serving Bill the CFS caused him to not speak to me)
Without a pause before the just because, and with a a rise-fall intonation at the end of the sentence, we get a reading with a wide-scoping negation:
NOT(CAUSE(serve cat-food sandwich)(speaking to me))
(i.e. Bill is speaking to me, but for reasons other than my serving him a CFS)
However, when we put the just because clause in front, as in Just because I served him a cat-food sandwich as a joke, Bill isn’t speaking to me, the only reading we get is the wide-scoping CAUSE.
Now consider just because X doesn’t mean Y. In passing, let’s note that just because is now not talking strictly about cause and effect, but about inference. This is not unusual in and of itself, because “inferential because” is a well-known phenomenon. For example, you can say, “Classes just let out, because the hallways are full of students,” but not mean that the crowded hallways caused classes to let out. What you really mean is that the fact that the hallways are full of students allows you to infer that classes have just let out. But what’s interesting about just because X doesn’t mean Y requires that NEG scope wider than (inferential) CAUSE, just the opposite of our cat-food sandwich example:
Variations on the just because and the doesn’t mean
Another point made in several of the articles is that JBS-DMY requires neither just because nor doesn’t mean to work. You can do it with simply because, or in the right context, plain old because. And instead of doesn’t mean, you’ll also hear other negations, such as is no reason to, or doesn’t make, or even rhetorical questions that imply a negative answer.
Just because with of complements, and “because X”
By analogy with ordinary because and because of, Kanetani observes, the just because construction now has a variant with just because of, as in
Just because of his dominance doesn’t mean they’re going to win games of footy or win or the clearances. (link)
The much-talked-about because X construction (in which X is something other than a full clause, such as a noun phrase, an adjective, a participle, or an interjection) has also now been folded into the analogy. Taking the top result from Tyler Schnoebelen’s listing of the most common words to appear in tweets after because, I did a search for “just because YOLO doesn’t mean” and found numerous examples like Just because YOLO doesn’t mean you can act like a moron.
Hilpert believes that the origin of the unusual semantics of JBX-DMY followed a sequence like this:
- Unremarkable sentences beginning with just because were already in the grammar, and some of them happened to have negated main clauses; for example, Just because I served him a cat-food sandwich as a joke, Bill isn’t speaking to me.
- Such constructions eventually came to be used with the inferential CAUSE meaning rather than a pure causation meaning.
- Finally, the inference-denying meaning of today’s JBX-DMY.
There’s a problem, though. In step 1, the semantics has CAUSEcausation>NOT, as discussed earlier. In step 3, the semantics has NOT>CAUSEinference. So there are two changes that have to happen in between: the scope change, and the change from causal to inferential just because. Whichever of those changes happens first, we end up with something that doesn’t seem to have the appropriate meaning, as illustrated below:
Just because he’s my nephew I didn’t hire him!
(Desired meaning impossible: that I hired my nephew for non-nepotistic reasons.)
Just because the streets are wet, it didn’t rain.
(Desired meaning impossible: that the sole fact of wet streets allows us to infer that it rained.)
I think a more likely progression is suggested by Bender and Kathol’s paper. Noting that there is flexibility over how the DMY part gets negated, imagine a sentence like this, in which the speaker seems to question the validity of an inference:
Just because I let him borrow my computer once, he seems to think he is allowed to use it any time he wants to.
The semantics here is the straightforward one you’d expect: For the sole reason that I let him borrow my computer once, he thinks he can use it whenever he wants. The negation, which is unspoken, permeates the whole utterance: This guy is wrong to think he can borrow my computer any old time now. From here, it’s a short step to turn that implied negative he seems to think into an actual one:
Just because I let him borrow my computer once, he shouldn’t think it’s his to borrow whenever.
Now we have NOT>CAUSEcausation, which we couldn’t get in our nepotism example. From here to that doesn’t mean doesn’t seem quite such a jump now. Subsequent elimination of the overt subject that or it, Hilpert argues, was due to the mostly empty meaning of the pronouns, plus the phonetic similarity of their final /t/ and the beginning /d/ of doesn’t. This part of his argument I’m inclined to believe.
Update, April 14, 2015: Doug was re-watching Iron Man this afternoon, and I heard this line of dialogue, uttered by bad guy Obadiah Stane to Tony Stark:
Do you really think that just because you have an idea, it belongs to you?
Without the framing rhetorical question of Do you really think…?, this is a straightforward instance of causal just because: if you have an idea, that makes it yours. But inside the rhetorical question, the clear meaning is that simply having an idea doesn’t make it yours. It’s an example, in the wild, of the type I was describing in the original post.