Third-person singular simple present indicative form of do one's bit

Third-person singular simple present indicative form of do somebody wrong

Third-person singular simple present indicative form of do one's thing

Third-person singular simple present indicative form of do the handsome thing

(colloquial, rhetorical question, mildly vulgar) A rhetorical question in response to a question to which the answer is an emphatic yes.

What is its price? How much money do you want for it?

Alternative form of it's not the whistle that pulls the train

(US, dated, colloquial, rhetorical question) A rhetorical question with the implied answer being that competitors do not share business secrets with one another.

Used to ask where the train is going.

Used to ask where the bus is going.