English verb conjugation
MUST FURTHER

Regular verb: further - furthered - furthered

Affirmation

Simple form	V-ing form
I must further you must further he must further we must further you must further they must further	I must be furthering you must be furthering he 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 he 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 he 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 mustn't further you mustn't further he mustn't further we mustn't further you mustn't further they mustn't further	I mustn't be furthering you mustn't be furthering he mustn't be furthering we mustn't be furthering you mustn't be furthering they mustn't be furthering
Perfect	V-ing perfect
I mustn't have furthered you mustn't have furthered he mustn't have furthered we mustn't have furthered you mustn't have furthered they mustn't have furthered	I mustn't have been furthering you mustn't have been furthering he mustn't have been furthering we mustn't have been furthering you mustn't have been furthering they mustn't have been furthering

Interrogative form

Simple form	V-ing form
must I further? must you further? must he further? must we further? must you further? must they further?	must I be furthering? must you be furthering? must he 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 he 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 he 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
mustn't I further? mustn't you further? mustn't he further? mustn't we further? mustn't you further? mustn't they further?	mustn't I be furthering? mustn't you be furthering? mustn't he be furthering? mustn't we be furthering? mustn't you be furthering? mustn't they be furthering?
Perfect	V-ing perfect
mustn't I have furthered? mustn't you have furthered? mustn't he have furthered? mustn't we have furthered? mustn't you have furthered? mustn't they have furthered?	mustn't I have been furthering? mustn't you have been furthering? mustn't he have been furthering? mustn't we have been furthering? mustn't you have been furthering? mustn't they have been furthering?