Fish use their swim bladder to float or sink in the water.

One part is important.

He admitted that it is difficult to execute the plan, saying 'it is easier said than done.'

We decided to start a new project by joining our companies.

His actions clearly contained a meaning of contempt.

A mass noun refers to a noun that cannot be counted.

She had a beautiful headdress on her head.

She called me 'Tom'.

There was a swelling on his leg.

There is nothing in his room.