English verb conjugation
MUST FURTHER

Regular verb: further - furthered - furthered

Affirmation

Simple form	V-ing form
I must further you must further she must further we must further you must further they must further	I must be furthering you must be furthering she must be furthering we must be furthering you must be furthering they must be furthering
Perfect	V-ing perfect
I must have furthered you must have furthered she must have furthered we must have furthered you must have furthered they must have furthered	I must have been furthering you must have been furthering she must have been furthering we must have been furthering you must have been furthering they must have been furthering

Negation

Simple form	V-ing form
I must not further you must not further she must not further we must not further you must not further they must not further	I must not be furthering you must not be furthering she must not be furthering we must not be furthering you must not be furthering they must not be furthering
Perfect	V-ing perfect
I must not have furthered you must not have furthered she must not have furthered we must not have furthered you must not have furthered they must not have furthered	I must not have been furthering you must not have been furthering she must not have been furthering we must not have been furthering you must not have been furthering they must not have been furthering

Interrogative form

Simple form	V-ing form
must I further? must you further? must she further? must we further? must you further? must they further?	must I be furthering? must you be furthering? must she be furthering? must we be furthering? must you be furthering? must they be furthering?
Perfect	V-ing perfect
must I have furthered? must you have furthered? must she have furthered? must we have furthered? must you have furthered? must they have furthered?	must I have been furthering? must you have been furthering? must she have been furthering? must we have been furthering? must you have been furthering? must they have been furthering?

Interro-negative form

Simple form	V-ing form
must I not further? must you not further? must she not further? must we not further? must you not further? must they not further?	must I not be furthering? must you not be furthering? must she not be furthering? must we not be furthering? must you not be furthering? must they not be furthering?
Perfect	V-ing perfect
must I not have furthered? must you not have furthered? must she not have furthered? must we not have furthered? must you not have furthered? must they not have furthered?	must I not have been furthering? must you not have been furthering? must she not have been furthering? must we not have been furthering? must you not have been furthering? must they not have been furthering?