If the relevant situation arises, then we will proceed with the plan.

I was about to leave the house, and just then, the phone rang.

He went thenabout to find his lost keys.

The thenoyltrifluoroacetone is a highly reactive compound.

He traveled thencefrom to the neighboring town.

He injured his thenal muscle while lifting weights.

Back then, I used to play soccer every day after school.

He had never seen such a beautiful sunset thentofore.

Better safe then sorry.