Just look it up: http://www.canoo.net/services/OnlineGrammar/Wort/Verb/Tempora/Futur1.html?lang=en http://www.canoo.net/services/OnlineGrammar/Wort/Verb/Tempora/Futur2.html http://www.mein-deutschbuch.de/lernen.php?menu_id=110 http://www.mein-deutschbuch.de/lernen.php?menu_id=111

Futur I is used if you want say what will happen in the future. – I werde gehen. Future II is used if you want to say what will be done in the future. – Ich werde gegangen sein Future II is used rarely and Future I is more common.