Tom nereye gitmesi gerektiğini kesin olarak bilmiyordu.
- Tom didn't know for certain where he should go.
Ben onun ne zaman geleceğini kesin olarak bilmiyorum.
- I don't know for certain when he will come.
For certain.
... be in this certain room at this certain part of town and it has to be, you know, all one ...
... families. We have some ideas about that, but that’s relatively less certain. ...