Make the passive (in P). Use the same verb as in the A sentence
1A: We learn English in class 4 times a week
1P: English is learned in class 4 times a week (by us).
2A: They don't use the computers in our classroom
2P: The computers in our classroom aren't used (by them)
3A: Special machines make the food into different shapes.
3P: The food are made into different shapes by special machines