English verb conjugation
COULD DESCRIBE

Regular verb: describe - described - described

Affirmation

Simple form	V-ing form
I could describe you could describe she could describe we could describe you could describe they could describe	I could be describing you could be describing she could be describing we could be describing you could be describing they could be describing
Perfect	V-ing perfect
I could have described you could have described she could have described we could have described you could have described they could have described	I could have been describing you could have been describing she could have been describing we could have been describing you could have been describing they could have been describing

Negation

Simple form	V-ing form
I could not describe you could not describe she could not describe we could not describe you could not describe they could not describe	I could not be describing you could not be describing she could not be describing we could not be describing you could not be describing they could not be describing
Perfect	V-ing perfect
I could not have described you could not have described she could not have described we could not have described you could not have described they could not have described	I could not have been describing you could not have been describing she could not have been describing we could not have been describing you could not have been describing they could not have been describing

Interrogative form

Simple form	V-ing form
could I describe? could you describe? could she describe? could we describe? could you describe? could they describe?	could I be describing? could you be describing? could she be describing? could we be describing? could you be describing? could they be describing?
Perfect	V-ing perfect
could I have described? could you have described? could she have described? could we have described? could you have described? could they have described?	could I have been describing? could you have been describing? could she have been describing? could we have been describing? could you have been describing? could they have been describing?

Interro-negative form

Simple form	V-ing form
could I not describe? could you not describe? could she not describe? could we not describe? could you not describe? could they not describe?	could I not be describing? could you not be describing? could she not be describing? could we not be describing? could you not be describing? could they not be describing?
Perfect	V-ing perfect
could I not have described? could you not have described? could she not have described? could we not have described? could you not have described? could they not have described?	could I not have been describing? could you not have been describing? could she not have been describing? could we not have been describing? could you not have been describing? could they not have been describing?