must fun
Verbo regular: fun - funed- funed

Afirmación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
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	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	

Negación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
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	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	

Forma interrogativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
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? 	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? 	

Forma interro-negativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
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? 	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?