How we will make sentence in English if something will happen in the future but still it is not 100 % sure? There is probability he may or may not be doing that particular work.
He might be doing the same kind of work next year.
(used to express possibility): They might be at the station.
Nothing is 100% certain to happen in the future. So any way of referring to the future in English is acceptable to refer to something that is not 100% certain to happen. For instance the way of expressing the strongest possible "certainty" about the future is the simple present. So, for example, you can say Tomorrow I leave at 7am. Nevertheless you can't be 100% certain that you will actually leave at 7.
Thus you should really clarify your sentence by adding some context.