English verb conjugation
MUST PROLONG

Regular verb: prolong - prolonged - prolonged

Affirmation

Simple form	V-ing form
I must prolong you must prolong she must prolong we must prolong you must prolong they must prolong	I must be prolonging you must be prolonging she must be prolonging we must be prolonging you must be prolonging they must be prolonging
Perfect	V-ing perfect
I must have prolonged you must have prolonged she must have prolonged we must have prolonged you must have prolonged they must have prolonged	I must have been prolonging you must have been prolonging she must have been prolonging we must have been prolonging you must have been prolonging they must have been prolonging

Negation

Simple form	V-ing form
I must not prolong you must not prolong she must not prolong we must not prolong you must not prolong they must not prolong	I must not be prolonging you must not be prolonging she must not be prolonging we must not be prolonging you must not be prolonging they must not be prolonging
Perfect	V-ing perfect
I must not have prolonged you must not have prolonged she must not have prolonged we must not have prolonged you must not have prolonged they must not have prolonged	I must not have been prolonging you must not have been prolonging she must not have been prolonging we must not have been prolonging you must not have been prolonging they must not have been prolonging

Interrogative form

Simple form	V-ing form
must I prolong? must you prolong? must she prolong? must we prolong? must you prolong? must they prolong?	must I be prolonging? must you be prolonging? must she be prolonging? must we be prolonging? must you be prolonging? must they be prolonging?
Perfect	V-ing perfect
must I have prolonged? must you have prolonged? must she have prolonged? must we have prolonged? must you have prolonged? must they have prolonged?	must I have been prolonging? must you have been prolonging? must she have been prolonging? must we have been prolonging? must you have been prolonging? must they have been prolonging?

Interro-negative form

Simple form	V-ing form
must I not prolong? must you not prolong? must she not prolong? must we not prolong? must you not prolong? must they not prolong?	must I not be prolonging? must you not be prolonging? must she not be prolonging? must we not be prolonging? must you not be prolonging? must they not be prolonging?
Perfect	V-ing perfect
must I not have prolonged? must you not have prolonged? must she not have prolonged? must we not have prolonged? must you not have prolonged? must they not have prolonged?	must I not have been prolonging? must you not have been prolonging? must she not have been prolonging? must we not have been prolonging? must you not have been prolonging? must they not have been prolonging?