Past Tense:
* I sent a letter to my grandmother.
* The company sent out a press release announcing the merger.
* He sent her a bouquet of flowers for her birthday.
Past Participle:
* The package has been sent.
* The message was sent by mistake.
* The email I sent was never received.
With Prepositions:
* He sent the package to his sister.
* She sent me a message through Instagram.
* The teacher sent the students out for recess.
Other Examples:
* The dog sent the ball flying through the air. (meaning "caused to move")
* He felt a shiver sent down his spine. (meaning "caused to happen")
As an adjective:
* The sent email was filled with grammatical errors. (meaning "already sent")