present simple:
Active:
- We make butter from milk.
- Somebody cleans these rooms every day.
- People never invite me to parties.
- How do they make butter?
Passive:
- Butter is made from milk.
- These rooms are cleaned every day.
- I am never invited to parties.
- How is butter made?
past simple:
Active:
- Somebody stole my car last week.
- Somebody stole my keys yesterday.
- They didn't invite me to the party.
- When did they build these houses?
Passive:
- My car was stolen last week.
- My keys were stolen yesterday.
- I wasn't invited to the party.
- When were these houses built?

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