Simple future, form The 'simple' future is composed of two parts: will / shall + the infinitive without 'to' Simple future, function The simple future refers to a time later than now, and expresses facts or certainty. In this case there is no 'attitude'. The simple future is used: a. to predict a future event: It will rain tomorrow. b. (with I/we) to express a spontaneous decision: I'll pay for the tickets by credit card. c. to express willingness: I'll do the washing-up. He'll carry your bag for you. d. (in the negative form) to express unwillingness: The baby won't eat his soup. I won't leaveuntil I've seen the manager! e. (with I in the interrogative form) to make an offer: Shall I open the window? f. (with we in the interrogative form) to make a suggestion: Shall we go to the cinema tonight? g. (with I in the interrogative form) to ask for advice or instructions: What shall I tell the boss about this money? h. (with you) to give orders: You will do exactly as I say. i. (with you) to give an invitation: Will you come to the dance with me? Will you marry me? NOTE: In modern English will is preferred to shall. With the other persons (you, he, she, they) shall is only used in literary or poetic situations, FUTURE WITH GOING TO 1. Future with Going to - form This form is composed of three elements: the appropriate form of the verb 'to be' + going to + the infinitive of the main verb: Subject 'to be' going to infinitive She is going to leave 2. Future with Going to - function The use of 'going to' to refer to future events suggests a very strong association with the present. The time is not important - it is later than now, but the attitude is that the event depends on a present situation, that we know about. So it is used: a) to refer to our plans and intentions: We're going to move to London next year. (= the plan is in our minds now.) b) to make predictions based on present evidence: Look at those clouds - it's going to pour with rain! (= It's clear from what I can see now.) Note: In everyday speech, 'going to' is often shortened to 'gonna', especially in American English. More examples: Plans and intentions: a. Is Freddy going to buy a new car soon? b. Are John and Pam going to visit Milan when they are in Italy? c. I think Nigel and Mary are going to have a party next week. Predictions based on present evidence: a. There's going to be a terrible accident! b. He's going to be a brilliant politician. c. I'm going to have terrible indigestion. NOTE: It is unusual to say 'I'm going to go to...' Instead, we use 'going to' + a place or event: Examples: We are going to the beach tomorrow. She is going to the ballet tonight. Are you going to the party tomorrow night?

Hi this italki site will help you, just scroll down to tenses http://www.italki.com/knowledge/page/ENGLISH%20GRAMMAR.htm

we can also use the presnt continuous to express the future to describe an action or event in the future, which has already been planned or prepared e.g. We're going on holiday tomorrow. I'm meeting my friend tonight. Are they visiting you next winter?