Ben onun ne zaman geleceğini kesin olarak bilmiyorum.
- I don't know for certain when he will come.
Tom nereye gitmesi gerektiğini kesin olarak bilmiyordu.
- Tom didn't know for certain where he should go.
For certain.
... your children have to be more than a certain height to get ...
... be in this certain room at this certain part of town and it has to be, you know, all one ...