A sentence has been given in Active/Passive voice. Out of the four given alternatives, select the one which best expresses the same sentence in Passive/Active voice.
A bad tooth kept him awake all night.
1
He was kept awake all night by a bad tooth.
2
He is kept awake all night by a bad tooth.
3
He would have been kept awake all night by a bad tooth.
4
A bad tooth would have kept him awake all night.