wouldn't know

(I) wouldn't know.

There is no way that I would know the answer to that question. John: When will the flight from Miami get in? Jane: Sorry, I wouldn't know. Bob: Are there many fish in the Amazon River? Mary: Gee, I wouldn't know.
See also: know
References in classic literature ?
If he was crazy, he wouldn't know, and I wouldn't know his mind either, and I wouldn't be that one jump ahead of him, and he'd get me and mess the whole cage up with my insides.
Besides, the planter insisted that Roxy wouldn't know where she was, at first, and that by the time she found out she would already have been contented.
I set down again, a-shaking all over, and got out my pipe for a smoke; for the house was all as still as death now, and so the widow wouldn't know.
Jake was going to play deef and dumb here, so the neighbors wouldn't know his voice.
We wouldn't know one from the other, and one of our rival's might slip in.
As for the second, he's only half-witted, and if he was better off he wouldn't know it.
And even if they did, they wouldn't know who it was and they's keep it mum for me.
You wouldn't know the brick house, Sarah,' says Jane.
Your own mother wouldn't know you like that--much less your sweetheart.
Sometimes, toward the end, I could see three of him in the ring at once, an' I wouldn't know which to hit an' which to duck .
I wouldn't know how to reach the mainland myself, an' know that none o' the other fellows would, so's you're the only one that knows anything of navigation you're the fellow I'll tie to.
I always think of you when I'm writing, Katharine, even when it's the sort of thing you wouldn't know about.
If he did speak, you wouldn't know what to say, but would cry or blush, or let him have his own way, instead of giving a good, decided no.
But, sure, you wouldn't know what that is, acushla, nor what it may mean to the likes of me.
Talk of trades, Miss Abbey, and the way they set their marks on men' (a subject which nobody had approached); 'who wouldn't know your brother to be a Steward
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