Why didn't you bring the matter to my notice?

They have built a perfect dam across the river.

An American scientist has won the Nobel Prize for Physics.

The noise of the traffic kept me awake.

The major points of the lesson were quickly learnt by the class,but they were also quickly forgotten by them.

Two motorcycle mechanics were arrested for their alleged involvement in innumerable vehicle thefts.

The comic scenes in the play were over done by the actors.

Das has posted the letter.

The boy laughed at the lame man.