Please click on these links to see a simplified explanation.
Present Simple - I like tea.
Past Simple - I won a race.
Future Simple with "will" - I will eat the last biscuit.
Future Simple with "going to" - I am going to eat some vegetables.
Present Continuous - I am eating dinner.
Past Continuous - I was watching TV.
Future Continuous - I will be lying on a beach next July.
Present Perfect Simple - I have seen this film three times.
Present Perfect Continuous - I have been living in London for ten years.
Past Perfect Simple - I had eaten all the cake.
Past Perfect Continuous - I had been learning Italian for two years.
Future Perfect Simple - I will have done my homework.
Future Perfect Continuous - I will have been waiting for four hours.