Literal:
* The fire crackled merrily in the fireplace.
* We built a fire to keep warm on the camping trip.
* The firefighter bravely put out the fire.
Figurative:
* Her words set my heart on fire.
* He was fired from his job after the scandal.
* He has a fire in his belly to succeed.
Idioms:
* Let's get this project off the ground and fire it up!
* They fired the old coach and hired a new one.
* I'm fired up about this new opportunity!
The best way to use "fire" in a sentence depends on the context and meaning you want to convey.