10. Present tenses in the passive Letters have been written by me. I have written letters. Present Perfect Letters are being written by me. I am writing letters. Present Continuous Letters are written by me. I write letters. Present Simple Passive Active Tense
11. Past tenses in the passive Letters had been written by me. I had written letters. Past Perfect Letters were being written by me. I was writing letters. Past Continuous Letters were written by me. I wrote letters. Past Simple Passive Active Tense
12. Future and modals Letters must be written by me. I must write letters. Modals (can, should, must, etc.) Letters are going to be written by me. I am going to write letters. be going to - future Letters will be written by me. I will write letters. Future Simple Passive Active Tense