His efforts are worthy of praise.

His efforts were praised by everyone.

In Sanskrit phonology, the concept of triphthong is important.

The spring breed of silkworms has started making cocoons.

This event is held with the sponsorship of local companies.

This event is supported by local companies.

He descended from the airplane using a parachute.

Every year, many fish gather in this river for spawning.

Frogs spawn when spring comes.

The sourness of this lemon adds a good accent to the dish.