Whose Idea or Who's Idea?

Here, the correct phrasing is whose idea, not who's idea. The question is actually “to whom does this idea belong” or “who came up with this idea?” As a result, the phrase is about finding out who possesses the idea. Therefore, we need a possessive pronoun like whose instead of a contraction like who is.

Whose or who's example?

Who's is a contraction, meaning it's two words stuck together. The formula: who + is, or who + has. For example: who's hungry? Whose is a possessive pronoun. Use it when you're asking (or telling) to whom something belongs.

Whose idea who's?

It's an apostrophe telling you that who's is short for "who is." Whose silly idea was it to make these words sound alike? Who knows? But whose shows possession and who's is a contraction. If you forget, remember that who's is often a question — it has a little space waiting for an answer.