must sass
Regular verb: sass - sassed- sassed

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must sass
you must sass
she must sass
we must sass
you must sass
they must sass 	I must be sassing
you must be sassing
she must be sassing
we must be sassing
you must be sassing
they must be sassing	I must have sassed
you must have sassed
she 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
she must have been sassing
we must have been sassing
you must have been sassing
they must have been sassing	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must not sass
you must not sass
she 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
she 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
she 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
she must not have been sassing
we must not have been sassing
you must not have been sassing
they must not have been sassing	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I sass?
must you sass?
must she sass?
must we sass?
must you sass?
must they sass? 	must I be sassing?
must you be sassing?
must she be sassing?
must we be sassing?
must you be sassing?
must they be sassing? 	must I have sassed?
must you have sassed?
must she 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 she have been sassing?
must we have been sassing?
must you have been sassing?
must they have been sassing? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I not sass?
must you not sass?
must she 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 she 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 she 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 she not have been sassing?
must we not have been sassing?
must you not have been sassing?
must they not have been sassing?