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 must not fun
you must not fun
he must not fun
we must not fun
you must not fun
they must not fun 	I must not be funing
you must not be funing
he must not be funing
we must not be funing
you must not be funing
they must not be funing	I must not have funed
you must not have funed
he must not have funed
we must not have funed
you must not have funed
they must not have funed	I must not have been funing
you must not have been funing
he must not have been funing
we must not have been funing
you must not have been funing
they must not 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 	
must I not fun?
must you not fun?
must he not fun?
must we not fun?
must you not fun?
must they not fun? 	must I not be funing?
must you not be funing?
must he not be funing?
must we not be funing?
must you not be funing?
must they not be funing? 	must I not have funed?
must you not have funed?
must he not have funed?
must we not have funed?
must you not have funed?
must they not have funed? 	must I not have been funing?
must you not have been funing?
must he not have been funing?
must we not have been funing?
must you not have been funing?
must they not have been funing?