Voice
He teaches us grammar.

Grammar will be taught to us by him.
We are taught grammar by him.
We were teached grammar by him.
Grammar was taught to us by him.

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Voice
The major points of the lesson were quickly learnt by the class,but they were also quickly forgotten by them.

The class learnt and forgot the major points of the lesson quickly.
The class quickly learnt the major points of the lesson but also forgot them quickly.
The class quickly learnt the major points of the lesson but they also forgot them.
The class quickly learnt but forgot the major points of the lesson.

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Voice
Two motorcycle mechanics were arrested for their alleged involvement in innumerable vehicle thefts.

For their alleged involvement in innumerable vehicle thefts, police had arrested two motorcycle mechanics.
The police arrested two motorcycle mechanics for their alleged involvement in innumerable vehicle thefts.
The police has arrested two motorcycle mechanics for their alleged involvement in innumerable vehicle thefts.
For their alleged involvement in innumerable vehicle thefts, two motor cycle mechanics have been arrested.

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