Auxiliary + infinitive combinations are made passive by using a passive infinitive.

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Professional Communication Skills Practice Test: Grammar - Interchanging Active and Passive Voice — practice the complete quiz, review flashcards, or try a random question.

One rule for changing Active voice to Passive voice: To write a passive sentence from an active voice sentence, first, interchange the object and subject

Active voice: She bought a new car. (She is the subject and a new car is an object.)

Passive voice: A new car was bought by her. (A new car is a subject and her is the object.)


Auxiliary + infinitive combinations are made passive by using a passive infinitive.