Formed

Rain formed pools in the hollow spaces on the rocks.

A bad habit, once formed, cannot easily be got rid of.

A bad habit, once formed, is difficult to get rid of.

Everyone formed couples and began dancing.

A new team was formed in order to take part in the boat race.

Clouds formed in the sky.

The boy more than justified the favourable opinion they had formed of him.

The idea formed in his mind.

The conclusion was formed on the basis of these facts.

A new team was formed in order to take part in the race.