What do you base your theory on? ✬

He didn't come back to the base yesterday. ✬

He threw the ball to first base. ✬

Base jumping is an extreme sport. ✬

There's a secret base on the moon. ✬

This base is now under our control. ✬

Tom used to play second base for his high school's baseball team. ✬

Tom stole a base. ✬

Ammonia is a base. ✬

Tom stole second base. ✬