English verb conjugation
COULD DOCUMENT

Regular verb: document - documented - documented

Affirmation

Simple form	V-ing form
I could document you could document he could document we could document you could document they could document	I could be documenting you could be documenting he could be documenting we could be documenting you could be documenting they could be documenting
Perfect	V-ing perfect
I could have documented you could have documented he could have documented we could have documented you could have documented they could have documented	I could have been documenting you could have been documenting he could have been documenting we could have been documenting you could have been documenting they could have been documenting

Negation

Simple form	V-ing form
I couldn't document you couldn't document he couldn't document we couldn't document you couldn't document they couldn't document	I couldn't be documenting you couldn't be documenting he couldn't be documenting we couldn't be documenting you couldn't be documenting they couldn't be documenting
Perfect	V-ing perfect
I couldn't have documented you couldn't have documented he couldn't have documented we couldn't have documented you couldn't have documented they couldn't have documented	I couldn't have been documenting you couldn't have been documenting he couldn't have been documenting we couldn't have been documenting you couldn't have been documenting they couldn't have been documenting

Interrogative form

Simple form	V-ing form
could I document? could you document? could he document? could we document? could you document? could they document?	could I be documenting? could you be documenting? could he be documenting? could we be documenting? could you be documenting? could they be documenting?
Perfect	V-ing perfect
could I have documented? could you have documented? could he have documented? could we have documented? could you have documented? could they have documented?	could I have been documenting? could you have been documenting? could he have been documenting? could we have been documenting? could you have been documenting? could they have been documenting?

Interro-negative form

Simple form	V-ing form
couldn't I document? couldn't you document? couldn't he document? couldn't we document? couldn't you document? couldn't they document?	couldn't I be documenting? couldn't you be documenting? couldn't he be documenting? couldn't we be documenting? couldn't you be documenting? couldn't they be documenting?
Perfect	V-ing perfect
couldn't I have documented? couldn't you have documented? couldn't he have documented? couldn't we have documented? couldn't you have documented? couldn't they have documented?	couldn't I have been documenting? couldn't you have been documenting? couldn't he have been documenting? couldn't we have been documenting? couldn't you have been documenting? couldn't they have been documenting?