Present Simple-write/writes an e-mail
Past Simple-wrote
Future Simple-will write
Present Continuous-am,is,are writing
Past Cont-was/were writing
Future Cont-will be writing
Present Perfect-have/has written
Past Perfect-had written
Future Perfect-will have written
Present perfect cont.- have been writing
Past Perfect cont.-had been writing .
Future Perfect cont - will have been writing
Present Simple-write/writes an e-mail
Past Simple-wrote
Future Simple-will write
Present Continuous-am,is,are writing
Past Cont-was/were writing
Future Cont-will be writing
Present Perfect-have/has written
Past Perfect-had written
Future Perfect-will have written
Present perfect cont.- have been writing
Past Perfect cont.-had been writing .
Future Perfect cont - will have been writing