Simple sentences:
* She is the best student in her class.
* This is the best day of my life.
* He always tries his best.
Complex sentences:
* Although the weather was bad, we had the best time at the beach.
* The restaurant's ambiance was so beautiful, it truly made the dining experience the best it could be.
* The chef's secret ingredient was the best-kept secret in the kitchen.
Sentences with different parts of speech:
* The best part of the trip was the view from the mountaintop. (adjective)
* We did our best to finish the project on time. (adverb)
* The best way to learn is by doing. (noun)
Idiomatic expressions:
* He's the best of the best.
* We're in the best of health.
* To the best of my knowledge, that's correct.
Remember: "Best" is a superlative adjective, meaning it indicates the highest degree of something. It's important to use it in context and avoid overusing it.