e.g. She will pass the exam
e.g. I'm sure you will enjoy the trip
e.g. The plane will be late since it always is.
Often we add "perhaps","maybe"，“prbably","possibly","I think" to make the belief less certain.
e.g. Maybe it will be ok.
e.g. He'll possibly find out when he sees Jenny.
2.future as an inevitable fact
e.g. I'll be thirty next month.
a spontaneous decisione.g. There is no buses today.Ok,I'll take a taxi.
补充：will与be going to的区别
be going to :decision made before the moment of speaking(表达一种计划和意愿）
e.g. I'm going to take a holiday after I finish the project.
一般现在时表示将来：timetable future
e.g. The train leaves at 6:00,so we must be hurry.
e.g.The summer holiday starts next week.
现在进行时表示将来：definit future arrangement.
e.g. Are you seeing Jane tomorrow?
e.g. What are you doing this Saturday evening? Are you guys playing?
(1.一定要有具体的时间状语 2.具体的时间状语必须是near future)