Simple Present Active: Rita writes a letter.
Passive: A letter is written by Rita.
Simple Past Active: Rita wrote a letter.
Passive: A letter was written by Rita.
Present Perfect Active: Rita has written a letter.
Passive: A letter has been written by Rita.
Future I Active: Rita will write a letter.
Passive: A letter will be written by Rita.
Hilfsverben Active: Rita can write a letter.
Passive: A letter can be written by Rita.
Examples of Passive
Present Progressive Active: Rita is writing a letter.
Passive: A letter is being written by Rita.
Past Progressive Active: Rita was writing a letter.
Passive: A letter was being written by Rita.
Past Perfect Active: Rita had written a letter.
Passive: A letter had been written by Rita.
Future II Active: Rita will have written a letter.
Passive: A letter will have been written by Rita..
Conditional I Active: Rita would write a letter.
Passive: A letter would be written by Rita.
Conditional II Active: Rita would have written a letter.
Passive: A letter would have been written
1. are watching
2. must
3. are sent
4. are being bought
5. has been repairing
6. Should
7. will be bought
8. lie
9. inhabit
10. Baby's
11. child