He was working on that project round the clock.

He is working round the clock.

The Six-Tusked White Elephant is said to be a legendary creature.

I went to the market accompanied by my mother.

My son participates in judo practice every day.

Deuterium is one of the isotopes of hydrogen.

A new polymer was produced by this chemical reaction.

He is good at flying an airplane.

Their trio enchanted the audience.

How much does this luggage weigh?