Future Simple uses "will" plus infinitive for all persons. Be going to uses "am/are/is" plus "going to" plus infinitive
Future simple describes actions that will happen in the future. Used with time expressions like "tomorrow" and "next week". Expresses decisions made at the moment
English has three future forms: will + base verb, be going to + base verb, and be + -ing verb. Will + base verb is formal and used for immediate future decisions. Be going to + base verb is casual and used for planned future actions. Be + -ing verb is casual and used for near future plans
Will and going to are interchangeable in casual speech. In formal writing, there is a clear distinction between them
Will indicates decisions made at speaking time. Will expresses future facts and promises. Will makes predictions using words like "probably" and "possibly"
Future tense uses "will" or "going to" with verb. Affirmative form: Subject + am/is/are + going to + verb. Negative form: Subject + am/is/are + not + going to + verb. Question form: Will + subject + verb + ?