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is done was done (passive 1 被动)
A
The office is cleaned every day.
The office was cleaned yesterday.
Compare active and passive:
Somebody cleans the office every day. (active)
The office is cleaned every day. (passive)
Somebody cleaned the office yesterday. (active)
The office was cleaned yesterday. (passive)
B
The passive is:
| present simple | am/ is/ are | (not) |
| past simple | was/ were |
+
| past participle | cleaned done invented built injured taken etc. |
The past participle of regular verbs is -ed (cleaned/ damaged etc.)
For a list of irregular past participles (done/ built/ taken etc.)
regular:
- Butter is made from milk.
- Oranges are imported into Britain.
- How often are these rooms cleaned?
- I am never invited to parties.
irregular:
- This house was built 100 years ago.
- These houses were built 100 years ago.
- When was the telephone invented?
- We weren't invited to the party last week.
- Was anybody injured in the accident? Yes, two people were taken to hospital.
C
was/ were born
- I was born in Berlin in 1989. (not I am born)
- Where were you born? In Cairo.
D
passive + by ...
- The telephone was invented by Alexander Bell in 1876. (= Alexander Bell invented it)
- I was bitten by a dog a few days ago.
- Do you like these paintings? They were painted by a friend of time.