could krass
Verbo regular: krass - krassed- krassed

Afirmação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I could krass
you could krass
he could krass
we could krass
you could krass
they could krass 	I could be krassing
you could be krassing
he could be krassing
we could be krassing
you could be krassing
they could be krassing	I could have krassed
you could have krassed
he 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
he could have been krassing
we could have been krassing
you could have been krassing
they could have been krassing	

Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I couldn't krass
you couldn't krass
he 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
he 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
he 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
he couldn't have been krassing
we couldn't have been krassing
you couldn't have been krassing
they couldn't have been krassing	

Forma interrogativa 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
could I krass?
could you krass?
could he krass?
could we krass?
could you krass?
could they krass? 	could I be krassing?
could you be krassing?
could he be krassing?
could we be krassing?
could you be krassing?
could they be krassing? 	could I have krassed?
could you have krassed?
could he 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 he have been krassing?
could we have been krassing?
could you have been krassing?
could they have been krassing? 	

Forma interro-Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
couldn't I krass?
couldn't you krass?
couldn't he 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 he 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 he 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 he have been krassing?
couldn't we have been krassing?
couldn't you have been krassing?
couldn't they have been krassing?