a comprehensive overview of the three main grammar tenses Present Past and Future Present Tense Used to describe Current actions General truths States of being Habits Forms Simple Pesent e g I walk Present Continuous e g I am walking Present Perfect Continuous e g I have Present Perfect e g I have walked been walking Past Tense Used to describe Completed actions Past events States of being in the past Forms Simple Past e g I walked Past Continuous e g I was walking Past Perfect Continuous e g I had Past Perfect e g I had walked been walking Future Tense Used to describe Future actions Predictions Plans Forms Simple Future e g I will walk Future Continuous e g I will be Future Perfect e g I will have Future Perfect Continuous e g walking walked I will have been walking