Here are some examples:
Simple present:
* The basketball slowly deflated.
* The news deflated her hopes.
Simple past:
* The tire deflated after hitting a pothole.
* His ego deflated after losing the competition.
Present participle:
* The deflating balloon made a hissing sound.
* The deflating economy worried many investors.
Past participle:
* The deflated balloon was lying on the ground.
* His deflated spirits needed a boost.
With object:
* He deflated the balloon by pressing the valve.
* The news deflated her dreams of success.
With prepositional phrase:
* The tire deflated in a matter of seconds.
* Her confidence deflated after the interview.
To help you understand the usage of "deflate" in a sentence, please provide me with more context or a specific situation.