Active and Passive
Transformation exercise
Transform active sentences into passive sentences and the other way round. Use all the words of the original sentence.
Example:
Satellites are used for different purposes. > We use satellites for different purposes.
Sputnik One was launched by the Russians in 1957.
> The Russians ... in 1957.
Since then many more satellites have been launched into space by different nations.
> Since then ...
The far side of the moon had never seen before.
> No one ...
Satellites can be used to forecast the weather.
> Experts ...
An orbit of the earth will be completed every ten hours.
> Every ten hours the satellite ...