simple future

In grammar, the future tense (abbreviated fut) is a verb form that marks the event described by the verb as not having happened yet, but expected to happen in the future (in an absolute tense system), or to happen subsequent to some other event, whether that is past, present, or future (in a relative tense system).
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SIMPLE FUTURE

Simple Future has two different forms in English: "will" and "be going to." Although the two forms can sometimes be used interchangeably, they often express two very different meanings. These different meanings might seem too abstract at first, but with time and practice, the differences will become clear. Both "will" and "be going to" refer to a specific time in the future.

FORM Will

[will + verb]

Examples:

• You will help him later.
• Will you help him later?
• You will not help him later.

FORM Be Going To

[am/is/are + going to + verb]

Examples:

• You are going to meet Jane tonight.
• Are you going to meet Jane tonight?
• You are not going to meet Jane tonight.

FUTURE CONTINOUS

Future Continuous has two different forms: "will be doing " and "be going to be doing." Unlike Simple Future forms, Future Continuous forms are usually interchangeable.

FORM Future Continuous with "Will"

[will be + present participle]

Examples:

• You will be waiting for her when her plane arrives tonight.
• Will you be waiting for her when her plane arrives tonight?
• You will not be waiting for her when her plane arrives tonight.

FORM Future Continuous with "Be Going To "

[am/is/are + going to be + present participle]

Examples:

• You are going to be waiting for her when her plane arrives tonight.
• Are you going to be waiting for her when her plane arrives tonight?
• You are not going to be waiting for her when her plane arrives tonight.

REMEMBER: It is possible to use either "will" or "be going to" to create the Future Continuous with little difference in meaning.

Future Perfect

Future Perfect has two different forms: "will have done" and "be going to have done." Unlike Simple Future forms, Future Perfect forms are usually interchangeable.

FORM Future Perfect with "Will"

[will have + past participle]

Examples:

• You will have perfected your English by the time you come back from the U.S.
• Will you have perfected your English by the time you come back from the U.S.?
• You will not have perfected your English by the time you come back from the U.S.

FORM Future Perfect with "Be Going To"

[am/is/are + going to have + past participle]

Examples:

• You are going to have perfected your English by the time you come back from the U.S.
• Are you going to have perfected your English by the time you come back from the U.S.?
• You are not going to have perfected your English by the time you come back from the U.S.

NOTE: It is possible to use either "will" or "be going to" to create the Future Perfect with little or no difference in meaning.

Future Perfect Continuous

Future Perfect Continuous has two different forms: "will have been doing " and "be going to have been doing." Unlike Simple Future forms, Future Perfect Continuous forms are usually interchangeable.

FORM Future Perfect Continuous with "Will"

[will have been + present participle]

Examples:

• You will have been waiting for more than two hours when her plane finally arrives.
• Will you have been waiting for more than two hours when her plane finally arrives?
• You will not have been waiting for more than two hours when her plane finally arrives.

FORM Future Perfect Continuous with "Be Going To"

[am/is/are + going to have been + present participle]

Examples:

• You are going to have been waiting for more than two hours when her plane finally arrives.
• Are you going to have been waiting for more than two hours when her plane finally arrives?
• You are not going to have been waiting for more than two hours when her plane finally arrives.

NOTE: It is possible to use either "will" or "be going to" to create the Future Perfect Continuous with little or no difference in meaning.

source are relevant:

http://www.englishpage.com/verbpage/futureperfectcontinuous.html