WILL;GOING TO..

WILL AND GOING TO

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.

WILL

afirmative --- negative --- Interrogative

She will go.. She won't go ..will she go.. ?

Form: subject + will + verb (indicative)

Uses: Promises, plans and intentions (not sure), ask politely or offer.

examples:

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

GOING TO

afirmative ------ negative ------- Interrogative

She is going to.. She isn't going to.. Is she going to..?

Form: subject + verb to be + going to + verb (indicative)

Uses: (segurity) intencions and plans, preditions with evidences, future events.

examples:

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

the information are from:
http://www.englishpage.com/verbpage/simplefuture.html
http://boards4.melodysoft.com/app?ID=omforum&msg=1006&DOC=201
http://www.oup.com/elt/global/products/headway/intermediate/a_grammar/unit05/hwy_int_unit05_2/