(John changed the flat tire). The passive voice of this sentence is:
The flat tire will be changed by John
O 1.
The flat tire was changed by John
O 2.
The flat tire is chaned by John
3.
The flat tire were changed by John
4.
(John changed the flat tire). The passive voice of this sentence is:
The flat tire will be changed by John
O 1.
The flat tire was changed by John
O 2.
The flat tire is chaned by John
3.
The flat tire were changed by John
4.