DEFINITION OF FUTURE TENSES IN ENGLISH GRAMMAR

FUTURE TENSE

1) Simple Future Tense-

Indicates an action that will take place after the present time and that has no real connection with the present time. 
For example, "She will visit her ailing grandmother soon."
                        "He will walk home."
Note
a. the form of Simple Future Tense is- will/shall + verb

2) Future Perfect Tense-

Indicates an action in the future that will have been completed before another time or event in the future.
For example, "By the time we arrive, he will have studied."

Note
a. The form of Future Perfect Tense is- will/shall have + verb(past participle form or 3rd form of the verb)

3) Future Continuous Tense-

Indicates an action in the future that is longer in duration than another action in the future.
For example, "He will be walking when it starts to rain."
Note
a. The form of Future Continuous Tense is-will/shall be + verb + ing

4) Future Perfect Continuous Tense-

Indicates an action in the future that will have been continuing until another time or event in the future.
For example, "He will have been exercising an hour at 2:00."
Note
a. The form of Future Perfect Continuous Tense is- will/shall have been + verb + ing