English verb conjugation
MUST DUMB

Regular verb: dumb - dumbed - dumbed

Affirmation

Simple form	V-ing form
I must dumb you must dumb she must dumb we must dumb you must dumb they must dumb	I must be dumbing you must be dumbing she must be dumbing we must be dumbing you must be dumbing they must be dumbing
Perfect	V-ing perfect
I must have dumbed you must have dumbed she must have dumbed we must have dumbed you must have dumbed they must have dumbed	I must have been dumbing you must have been dumbing she must have been dumbing we must have been dumbing you must have been dumbing they must have been dumbing

Negation

Simple form	V-ing form
I mustn't dumb you mustn't dumb she mustn't dumb we mustn't dumb you mustn't dumb they mustn't dumb	I mustn't be dumbing you mustn't be dumbing she mustn't be dumbing we mustn't be dumbing you mustn't be dumbing they mustn't be dumbing
Perfect	V-ing perfect
I mustn't have dumbed you mustn't have dumbed she mustn't have dumbed we mustn't have dumbed you mustn't have dumbed they mustn't have dumbed	I mustn't have been dumbing you mustn't have been dumbing she mustn't have been dumbing we mustn't have been dumbing you mustn't have been dumbing they mustn't have been dumbing

Interrogative form

Simple form	V-ing form
must I dumb? must you dumb? must she dumb? must we dumb? must you dumb? must they dumb?	must I be dumbing? must you be dumbing? must she be dumbing? must we be dumbing? must you be dumbing? must they be dumbing?
Perfect	V-ing perfect
must I have dumbed? must you have dumbed? must she have dumbed? must we have dumbed? must you have dumbed? must they have dumbed?	must I have been dumbing? must you have been dumbing? must she have been dumbing? must we have been dumbing? must you have been dumbing? must they have been dumbing?

Interro-negative form

Simple form	V-ing form
mustn't I dumb? mustn't you dumb? mustn't she dumb? mustn't we dumb? mustn't you dumb? mustn't they dumb?	mustn't I be dumbing? mustn't you be dumbing? mustn't she be dumbing? mustn't we be dumbing? mustn't you be dumbing? mustn't they be dumbing?
Perfect	V-ing perfect
mustn't I have dumbed? mustn't you have dumbed? mustn't she have dumbed? mustn't we have dumbed? mustn't you have dumbed? mustn't they have dumbed?	mustn't I have been dumbing? mustn't you have been dumbing? mustn't she have been dumbing? mustn't we have been dumbing? mustn't you have been dumbing? mustn't they have been dumbing?