Question

establish a building management committee -change to passive sentence ​

Answer 1

It was established by a building management committee .

Explanation:

• There are two types of voice in the English language i.e. active and passive voice.

• When you change the object of a verb into the subject of the sentence a passive sentence is made.

• It means, whatever the action is being done by anyone is not the grammatical topic of the sentence.  

• An active voice is when the subject in a sentence is more active and it does not need the support of the verb or object.

Answer 2

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It was established by a building management committee.