English verb conjugation
MUST DESCEND

Regular verb: descend - descended - descended

Affirmation

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

Negation

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

Interrogative form

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

Interro-negative form

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