I deem it necessary to take action.

He tried to cheat on the test, but he got caught.

He fell into a slump after losing his job.

The caterpillar undergoes a transformation and becomes a butterfly.

The approval is conditional upon meeting all the requirements.

The separation of the two substances is necessary for the experiment.

He made a prudent decision before investing his money.

The president will proclaim a new policy tomorrow.

Her acceptance of the award was met with applause.

The viewer watched the TV.