must sass
Verbo regular: sass - sassed- sassed

Afirmación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I must sass
you must sass
he must sass
we must sass
you must sass
they must sass 	I must be sassing
you must be sassing
he must be sassing
we must be sassing
you must be sassing
they must be sassing	I must have sassed
you must have sassed
he must have sassed
we must have sassed
you must have sassed
they must have sassed	I must have been sassing
you must have been sassing
he must have been sassing
we must have been sassing
you must have been sassing
they must have been sassing	

Negación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I must not sass
you must not sass
he must not sass
we must not sass
you must not sass
they must not sass 	I must not be sassing
you must not be sassing
he must not be sassing
we must not be sassing
you must not be sassing
they must not be sassing	I must not have sassed
you must not have sassed
he must not have sassed
we must not have sassed
you must not have sassed
they must not have sassed	I must not have been sassing
you must not have been sassing
he must not have been sassing
we must not have been sassing
you must not have been sassing
they must not have been sassing	

Forma interrogativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
must I sass?
must you sass?
must he sass?
must we sass?
must you sass?
must they sass? 	must I be sassing?
must you be sassing?
must he be sassing?
must we be sassing?
must you be sassing?
must they be sassing? 	must I have sassed?
must you have sassed?
must he have sassed?
must we have sassed?
must you have sassed?
must they have sassed? 	must I have been sassing?
must you have been sassing?
must he have been sassing?
must we have been sassing?
must you have been sassing?
must they have been sassing? 	

Forma interro-negativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
must I not sass?
must you not sass?
must he not sass?
must we not sass?
must you not sass?
must they not sass? 	must I not be sassing?
must you not be sassing?
must he not be sassing?
must we not be sassing?
must you not be sassing?
must they not be sassing? 	must I not have sassed?
must you not have sassed?
must he not have sassed?
must we not have sassed?
must you not have sassed?
must they not have sassed? 	must I not have been sassing?
must you not have been sassing?
must he not have been sassing?
must we not have been sassing?
must you not have been sassing?
must they not have been sassing?