As an adjective:
* The quick brown fox jumped over the lazy dog.
* She had a quick wit and could always come up with a clever response.
* He made a quick decision to leave the party early.
As an adverb:
* I quickly finished my homework so I could go outside.
* The car quickly accelerated down the highway.
* She quickly realized her mistake and apologized.
In common phrases:
* We need to be quick about this.
* Let's take a quick break.
* I just wanted to say a quick hello.
Other examples:
* The recipe promised a quick and easy meal.
* He was in a quick temper that day.
* The doctor said the patient was making a quick recovery.