Question

change this sentences into passive voice we have produce d a number pf books for children

Answer 1

we have produced a number of books for children

=> A number of books have been produced by us for the children .

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Answer 2

Active Voice refers to a sentence in which the subject is performing the action.

Passive Voice refers to a sentence in which the subject undergoes the action. In other words, is writing the sentence in reverse order.

Example: Vivienne is buying flowers. (Active)

               Flowers are being bought by Vivienne. (Passive)

NOTE: Sentences that convey habitual actions cannot be changed to passive  mode.

We have produced a number of books for children. (Active)

A number of books have been produced by us for children. (Passive)