I write a letter every day.Present Simple I am writing a letter now. Present Continuous I have written a letter. Present Perfect I have been writing a letter for two hours. Present Perfect Continuous I wrote a letter yesterday. Past Simple I was writing a letter yesterday at 5. Past Continuous I had written a letter by the time you came. Past Perfect I had been writing a letter for two hours by 5 o’clock. Past Perfect Continuous I will write a letter tomorrow . Future Simple I will be writing a letter tomorrow at 5. Future Continuous I will have written a letter by the time you come. Future Perfect I will have been writing a letter for two hours by 5 o’clock. Future Perfect Continuous