English verb conjugation
COULD DESCRIBE

Regular verb: describe - described - described

Affirmation

Simple form	V-ing form
I could describe you could describe he could describe we could describe you could describe they could describe	I could be describing you could be describing he 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 he 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 he 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 couldn't describe you couldn't describe he couldn't describe we couldn't describe you couldn't describe they couldn't describe	I couldn't be describing you couldn't be describing he couldn't be describing we couldn't be describing you couldn't be describing they couldn't be describing
Perfect	V-ing perfect
I couldn't have described you couldn't have described he couldn't have described we couldn't have described you couldn't have described they couldn't have described	I couldn't have been describing you couldn't have been describing he couldn't have been describing we couldn't have been describing you couldn't have been describing they couldn't have been describing

Interrogative form

Simple form	V-ing form
could I describe? could you describe? could he describe? could we describe? could you describe? could they describe?	could I be describing? could you be describing? could he 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 he 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 he 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
couldn't I describe? couldn't you describe? couldn't he describe? couldn't we describe? couldn't you describe? couldn't they describe?	couldn't I be describing? couldn't you be describing? couldn't he be describing? couldn't we be describing? couldn't you be describing? couldn't they be describing?
Perfect	V-ing perfect
couldn't I have described? couldn't you have described? couldn't he have described? couldn't we have described? couldn't you have described? couldn't they have described?	couldn't I have been describing? couldn't you have been describing? couldn't he have been describing? couldn't we have been describing? couldn't you have been describing? couldn't they have been describing?