2) I'm certain you'll pass your exams.
You will definitely pass your exams.
3) I don't think it'll rain tomorrow.
I doubt it will rain tomorrow.
4) You'll definitely enjoy the film.
I am sure you will enjoy the fim.
5) It's possible that Ben will come round later.
Ben might come round later.
6) I might not go to school tomorrow.
I may not go to school tomorrow.
7) George will probably know the answer.
I think George will know the answer.
8) I doubt we'll go away this summer.
We won't probably go away this summer.