When we talk about probability in English, we have several options to choose from, but one thing we must be careful with is the simple error of word order. Be careful not to make this basic mistake:
Probably cannot go at the beginning of a sentence, it goes after the auxiliary verb, for example:
I will probably get a new car in the near future.
You are probably going to miss next week´s class because of your exams.
We have probably been chosen to represent the university at athletics.
Probably I will have a good time on holiday
Perhaps goes at the beginning of a sentence, for instance:
Perhaps you will be luckier next time.
Perhaps can also go at the end of a sentence:
She would be a better candidate than you, perhaps.
Maybe also goes at the beginning of a sentence.
Maybe it wasn´t such a good idea to skip class last week.
Try to use the fixed phrase of maybe or maybe not to experess uncertainty.
The modal verbs might and could can be used to express probability too:
I might have fun at the party if I am in the right mood.
I could have the chance of winning the race if I train hard enough.