The whistle blew. ✬

I heard someone whistle. ✬

It's as clean as a whistle. ✬

Tom can't play the tin whistle very well. ✬

The police officer blew his whistle. ✬

We were wakened by the whistle of the steam locomotive at dawn. ✬

The whistle of the steam train woke us at daybreak. ✬

Don't whistle at school. ✬

She's trying to whistle, but she doesn't know how. ✬

Tom can't whistle. ✬