Tenses

 Simple tence

Present simple tence -I write letter.

Past simple tence       -I  wrote leter.

Future simple tence   - I  writing letter.

 tence     

Present continues tence- I am writing letter.

Past continues tence      - I was writing letter.

Future continues tence - I will be writing letter.

Perfect tence

Present perfect tence-I have write  letter.

Past perfect tence-  I had writing letter.

Future perfect tence- I will have writing letter.

Perfect continues tence.

Present perfect continues tence- I  have been writing letter.

Past perfect continues tence- I  had been writing letter.

Future perfect continues tence- I will have been writing letter.