I judge by the car he drives. I'd say he's got a pretty good job.
A.Because I judge by the car he drives, I'd say he's got a pretty good job.
B.When I judge by the car he drives, I'd say he's got a pretty good job.
C.Unless I judge by the car he drives, I'd say he's got a pretty good job.
D.Judging by the car he drives, I'd say he's got a pretty good job.