Rewrite the sentences into the passive voice.
They asked the teacher a difficult question.
The teacher was asked a difficult question. / A difficult question was asked.
The teacher always answers the students’ questions.
The students’ questions are always answered.
Sue changed the flat tire. The flat tire was changed.
Beautiful giraffes roam the Savannah. The Savannah is roamed.
The saltwater corroded the metal beams. The metal beams were corroded.