English verb conjugation
COULD WRITE

Irregular verb: write - wrote - written

Affirmation

Simple form	V-ing form
I could write you could write he could write we could write you could write they could write	I could be writing you could be writing he could be writing we could be writing you could be writing they could be writing
Perfect	V-ing perfect
I could have written you could have written he could have written we could have written you could have written they could have written	I could have been writing you could have been writing he could have been writing we could have been writing you could have been writing they could have been writing

Negation

Simple form	V-ing form
I couldn't write you couldn't write he couldn't write we couldn't write you couldn't write they couldn't write	I couldn't be writing you couldn't be writing he couldn't be writing we couldn't be writing you couldn't be writing they couldn't be writing
Perfect	V-ing perfect
I couldn't have written you couldn't have written he couldn't have written we couldn't have written you couldn't have written they couldn't have written	I couldn't have been writing you couldn't have been writing he couldn't have been writing we couldn't have been writing you couldn't have been writing they couldn't have been writing

Interrogative form

Simple form	V-ing form
could I write? could you write? could he write? could we write? could you write? could they write?	could I be writing? could you be writing? could he be writing? could we be writing? could you be writing? could they be writing?
Perfect	V-ing perfect
could I have written? could you have written? could he have written? could we have written? could you have written? could they have written?	could I have been writing? could you have been writing? could he have been writing? could we have been writing? could you have been writing? could they have been writing?

Interro-negative form

Simple form	V-ing form
couldn't I write? couldn't you write? couldn't he write? couldn't we write? couldn't you write? couldn't they write?	couldn't I be writing? couldn't you be writing? couldn't he be writing? couldn't we be writing? couldn't you be writing? couldn't they be writing?
Perfect	V-ing perfect
couldn't I have written? couldn't you have written? couldn't he have written? couldn't we have written? couldn't you have written? couldn't they have written?	couldn't I have been writing? couldn't you have been writing? couldn't he have been writing? couldn't we have been writing? couldn't you have been writing? couldn't they have been writing?