English verb conjugation
MUST FUN

Regular verb: fun - funed - funed

Affirmation

Simple form	V-ing form
I must fun you must fun he must fun we must fun you must fun they must fun	I must be funing you must be funing he must be funing we must be funing you must be funing they must be funing
Perfect	V-ing perfect
I must have funed you must have funed he must have funed we must have funed you must have funed they must have funed	I must have been funing you must have been funing he must have been funing we must have been funing you must have been funing they must have been funing

Negation

Simple form	V-ing form
I mustn't fun you mustn't fun he mustn't fun we mustn't fun you mustn't fun they mustn't fun	I mustn't be funing you mustn't be funing he mustn't be funing we mustn't be funing you mustn't be funing they mustn't be funing
Perfect	V-ing perfect
I mustn't have funed you mustn't have funed he mustn't have funed we mustn't have funed you mustn't have funed they mustn't have funed	I mustn't have been funing you mustn't have been funing he mustn't have been funing we mustn't have been funing you mustn't have been funing they mustn't have been funing

Interrogative form

Simple form	V-ing form
must I fun? must you fun? must he fun? must we fun? must you fun? must they fun?	must I be funing? must you be funing? must he be funing? must we be funing? must you be funing? must they be funing?
Perfect	V-ing perfect
must I have funed? must you have funed? must he have funed? must we have funed? must you have funed? must they have funed?	must I have been funing? must you have been funing? must he have been funing? must we have been funing? must you have been funing? must they have been funing?

Interro-negative form

Simple form	V-ing form
mustn't I fun? mustn't you fun? mustn't he fun? mustn't we fun? mustn't you fun? mustn't they fun?	mustn't I be funing? mustn't you be funing? mustn't he be funing? mustn't we be funing? mustn't you be funing? mustn't they be funing?
Perfect	V-ing perfect
mustn't I have funed? mustn't you have funed? mustn't he have funed? mustn't we have funed? mustn't you have funed? mustn't they have funed?	mustn't I have been funing? mustn't you have been funing? mustn't he have been funing? mustn't we have been funing? mustn't you have been funing? mustn't they have been funing?