Covered-wagon camper allows the Ross family of insect collectors to explore remote regions. A Thai family comes to call as Mrs. Ross prepares lunch; their son Clark goes to check specimens in the trucks lab.
National Geographic - September, 1965
can i borrow a pencil
i don't know, CAN you?
yes, also colloquial irregularities occur frequently in any language and since you and the rest of our present company understood my intended meaning, being particular about the distinctions between "can" and "may" is purely pedantic and arguably pretentious