The base of the tower is made of concrete.

The story is based on fact.

He has a base character.

The decision was based on the results of the study.

The bases of this theory are still being studied.

Such a based class! what the heck !

The runner slid into home base, scoring the winning run.

The rocket base is heavily guarded.

He slid into second base to avoid being tagged out.

I bought some snacks at the base exchange.