could krass
Regular verb: krass - krassed- krassed

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could krass
you could krass
she could krass
we could krass
you could krass
they could krass 	I could be krassing
you could be krassing
she could be krassing
we could be krassing
you could be krassing
they could be krassing	I could have krassed
you could have krassed
she could have krassed
we could have krassed
you could have krassed
they could have krassed	I could have been krassing
you could have been krassing
she could have been krassing
we could have been krassing
you could have been krassing
they could have been krassing	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I couldn't krass
you couldn't krass
she couldn't krass
we couldn't krass
you couldn't krass
they couldn't krass 	I couldn't be krassing
you couldn't be krassing
she couldn't be krassing
we couldn't be krassing
you couldn't be krassing
they couldn't be krassing	I couldn't have krassed
you couldn't have krassed
she couldn't have krassed
we couldn't have krassed
you couldn't have krassed
they couldn't have krassed	I couldn't have been krassing
you couldn't have been krassing
she couldn't have been krassing
we couldn't have been krassing
you couldn't have been krassing
they couldn't have been krassing	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I krass?
could you krass?
could she krass?
could we krass?
could you krass?
could they krass? 	could I be krassing?
could you be krassing?
could she be krassing?
could we be krassing?
could you be krassing?
could they be krassing? 	could I have krassed?
could you have krassed?
could she have krassed?
could we have krassed?
could you have krassed?
could they have krassed? 	could I have been krassing?
could you have been krassing?
could she have been krassing?
could we have been krassing?
could you have been krassing?
could they have been krassing? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
couldn't I krass?
couldn't you krass?
couldn't she krass?
couldn't we krass?
couldn't you krass?
couldn't they krass? 	couldn't I be krassing?
couldn't you be krassing?
couldn't she be krassing?
couldn't we be krassing?
couldn't you be krassing?
couldn't they be krassing? 	couldn't I have krassed?
couldn't you have krassed?
couldn't she have krassed?
couldn't we have krassed?
couldn't you have krassed?
couldn't they have krassed? 	couldn't I have been krassing?
couldn't you have been krassing?
couldn't she have been krassing?
couldn't we have been krassing?
couldn't you have been krassing?
couldn't they have been krassing?