"it's John" is a grammatically correct and usable phrase in written English.
You would typically use it in a sentence like: I saw John yesterday and he said, "It's John."
"It's John Sterling's nonplanned, nonsensical genius that he focuses all his energy on a forgotten word: the".
It's John here they wanted to skin alive".
"Alison, it's John," our builder said.
Tell her it's John — she'll know".
When he answered it the voice on the other end of the line said, "Hey, Coach, it's John".
"It's John le Carré, so of course you don't know who to trust," Susan Moldow, publisher of Scribner, said.
Perhaps it's John Evans's love affair with books coming through.
But that's neither the facts' fault nor the genre's; it's John D'Agata's.
If that makes me a grumpy old man, it's John McClane's fault.
It's John Rankin's first final at 30 and he'll want to go and cherish that as well".
If ever there was an image with the power to alter the world forever it's John Snow's map of cholera spread in London.
