English verb conjugation
COULD DESCEND

Regular verb: descend - descended - descended

Affirmation

Simple form	V-ing form
I could descend you could descend she could descend we could descend you could descend they could descend	I could be descending you could be descending she could be descending we could be descending you could be descending they could be descending
Perfect	V-ing perfect
I could have descended you could have descended she could have descended we could have descended you could have descended they could have descended	I could have been descending you could have been descending she could have been descending we could have been descending you could have been descending they could have been descending

Negation

Simple form	V-ing form
I could not descend you could not descend she could not descend we could not descend you could not descend they could not descend	I could not be descending you could not be descending she could not be descending we could not be descending you could not be descending they could not be descending
Perfect	V-ing perfect
I could not have descended you could not have descended she could not have descended we could not have descended you could not have descended they could not have descended	I could not have been descending you could not have been descending she could not have been descending we could not have been descending you could not have been descending they could not have been descending

Interrogative form

Simple form	V-ing form
could I descend? could you descend? could she descend? could we descend? could you descend? could they descend?	could I be descending? could you be descending? could she be descending? could we be descending? could you be descending? could they be descending?
Perfect	V-ing perfect
could I have descended? could you have descended? could she have descended? could we have descended? could you have descended? could they have descended?	could I have been descending? could you have been descending? could she have been descending? could we have been descending? could you have been descending? could they have been descending?

Interro-negative form

Simple form	V-ing form
could I not descend? could you not descend? could she not descend? could we not descend? could you not descend? could they not descend?	could I not be descending? could you not be descending? could she not be descending? could we not be descending? could you not be descending? could they not be descending?
Perfect	V-ing perfect
could I not have descended? could you not have descended? could she not have descended? could we not have descended? could you not have descended? could they not have descended?	could I not have been descending? could you not have been descending? could she not have been descending? could we not have been descending? could you not have been descending? could they not have been descending?