English verb conjugation
MUST CUMBER

Regular verb: cumber - cumbered - cumbered

Affirmation

Simple form	V-ing form
I must cumber you must cumber he must cumber we must cumber you must cumber they must cumber	I must be cumbering you must be cumbering he must be cumbering we must be cumbering you must be cumbering they must be cumbering
Perfect	V-ing perfect
I must have cumbered you must have cumbered he must have cumbered we must have cumbered you must have cumbered they must have cumbered	I must have been cumbering you must have been cumbering he must have been cumbering we must have been cumbering you must have been cumbering they must have been cumbering

Negation

Simple form	V-ing form
I mustn't cumber you mustn't cumber he mustn't cumber we mustn't cumber you mustn't cumber they mustn't cumber	I mustn't be cumbering you mustn't be cumbering he mustn't be cumbering we mustn't be cumbering you mustn't be cumbering they mustn't be cumbering
Perfect	V-ing perfect
I mustn't have cumbered you mustn't have cumbered he mustn't have cumbered we mustn't have cumbered you mustn't have cumbered they mustn't have cumbered	I mustn't have been cumbering you mustn't have been cumbering he mustn't have been cumbering we mustn't have been cumbering you mustn't have been cumbering they mustn't have been cumbering

Interrogative form

Simple form	V-ing form
must I cumber? must you cumber? must he cumber? must we cumber? must you cumber? must they cumber?	must I be cumbering? must you be cumbering? must he be cumbering? must we be cumbering? must you be cumbering? must they be cumbering?
Perfect	V-ing perfect
must I have cumbered? must you have cumbered? must he have cumbered? must we have cumbered? must you have cumbered? must they have cumbered?	must I have been cumbering? must you have been cumbering? must he have been cumbering? must we have been cumbering? must you have been cumbering? must they have been cumbering?

Interro-negative form

Simple form	V-ing form
mustn't I cumber? mustn't you cumber? mustn't he cumber? mustn't we cumber? mustn't you cumber? mustn't they cumber?	mustn't I be cumbering? mustn't you be cumbering? mustn't he be cumbering? mustn't we be cumbering? mustn't you be cumbering? mustn't they be cumbering?
Perfect	V-ing perfect
mustn't I have cumbered? mustn't you have cumbered? mustn't he have cumbered? mustn't we have cumbered? mustn't you have cumbered? mustn't they have cumbered?	mustn't I have been cumbering? mustn't you have been cumbering? mustn't he have been cumbering? mustn't we have been cumbering? mustn't you have been cumbering? mustn't they have been cumbering?