Passive voice
Careless drivingcauses many accidents
They will take a good care of the child in the country.
By 1970 they had finished the construction of the stadium.
When professor Brown enterd the classroom the students greeted him warmly.
You usually spend a lot of time on such kind of work.
The archelogists often put up tents in these places.
We must discuss the new school problems.
She has improved her pronunciation.
By this time yesterday he had painted the picture.
They have just asked me about it.
His parents promised him a new car.

1) Many accidents is caused by careless driving.2) The child will be Taken a good care in the country.3) The construction of the stadium had been finished by 1970.4) Professor Brown was greeted warmly by the students.5) Such kind of work is usually spent a lot of time.6) Tents is often put in these places by the archelogists.7) The new school problems must be discussed.8) Her pronunciation has been improved.9) The picture had been painted by this time yesterday.10) I was asked about it.11) A new car was promised to him.