Knowing first-aid can be helpful in emergency situations.

He always travels first-class when he flies.

This is the first-degree of the program.

She is a first-nighter and never misses the opening night of any play.

He is a first-rate chef.

He is the first-string player on the team.

Knowing first aid can save lives in emergency situations.

He reached first base before the ball was caught.

I always fly first class when I travel.

My first cousin is coming to visit me next week.