| I am writing | We are writing |
| You are writing | You are writing |
| He is writing | They are writing |
This is called the present progressive tense.
It may be that you wish to be emphatic, and you say,
| I do write | We do write |
| You do write | You do write |
| He does write | They do write |
This is called the emphatic present tense.
The past tense indicates that the action took place in past time; as,
| I wrote | We wrote |
| You wrote | You wrote |
| He wrote | They wrote |
or, the past progressive; as,
| I was writing | We were writing |
| You were writing | You were writing |
| He was writing | They were writing |