Use probably with will and won't.
Rewrite the sentences in a different way, without changing the meaning.(1-это пример)
1) I think I'll go shopping at the weekend
1)I'll probably go shopping at the weekend
2)I'm almost sure I won't buy anything
3)I don't think England will beat Brazil tonight
4)But i think it'll be an exciting match
5)I don't think I'll go out this evening
6)I think i'll stay at home