could sass
Regular verb: sass - sassed- sassed

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

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

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

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