Question

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REWRITE THE SENTENCES USING PASSIVE STRUCTURES

They received a patent for the invention of this medicine fifteen years ago.
Who discovered the penicillin?
They are introducing new software now.
They are developing a new model of a digital camera now.
Who invented the sewing machine?
When will they use new software?

Answer 1

A patent for the invention of this medicine was received  fifteen years ago.
Who was  the penicillin discovered by?
New software is being introduced  now.
A new model of a digital camera is being developed  now.
Who was the sewing machine invented by?
When will new software be used?