A verb that refers to a future time is said to be in the future tense.
1.Simple Future Tense
a.The simple future is used to talk about things which we cannot control.It expresses the future as a fact.
Eg:I shall be twenty next week.
b. We use this tense to talk about what we think or believe will happen in the future.
Eg:I think Pakistan will win the match.
c.We also use this tense when we decide to do something at the time of speaking.
Eg:It is raining.I will take an umbrella.
3.Future Perfect Tense
This tense is used to talk about actions that will be completed by a certain future time.
E.g.: 1. I shall have written my exercise by then.
2.He will have left before you go to see him.
4.Future Perfect Continuous Tense
This tense is used for actions which will be in progress over a period of time that will end in the future.
E.g.:By next March we shall have been living there for four years