Present and Past Tense

Present Simple	Routine, habits, repetitive actions : I play tennis every Saturday. Tastes : I like chocolate, I hate doing homework. Facts : The sun rises in the east.
Present Continuous	Continuous actions :  - at the time of speaking I am reading this explanation now. - around now : I am learning English this year. Planned future arrangements : I am visiting Rome next Monday.
Present Perfect	Continuous form: An action started in the past that continues today : I have been learning English since September. Simple form :  The completed or finished part of that action : We have revised grammar rules and verb tenses.
Past Simple	Finished actions at a specific finished time in the past. Last year I bought a new car. I saw your dog 5 minutes ago.
Past Continuous	Continuous actions A continuous action at a specific time in the past : I was having breakfast at 7 o'clock this morning. A continuous action taking place when another brief event occurred : I was watching television when the phone rang.
Past Perfect	Continuous form: A past continuous action prior to another event in the past: I had been driving for 3 hours before I stopped. Simple form :  A completed action before another action in the past : I had finished the book before I gave it to Tom.