could crater
Verbo regular: crater - cratered- cratered

Afirmación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I could crater
you could crater
he could crater
we could crater
you could crater
they could crater 	I could be cratering
you could be cratering
he could be cratering
we could be cratering
you could be cratering
they could be cratering	I could have cratered
you could have cratered
he could have cratered
we could have cratered
you could have cratered
they could have cratered	I could have been cratering
you could have been cratering
he could have been cratering
we could have been cratering
you could have been cratering
they could have been cratering	

Negación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I couldn't crater
you couldn't crater
he couldn't crater
we couldn't crater
you couldn't crater
they couldn't crater 	I couldn't be cratering
you couldn't be cratering
he couldn't be cratering
we couldn't be cratering
you couldn't be cratering
they couldn't be cratering	I couldn't have cratered
you couldn't have cratered
he couldn't have cratered
we couldn't have cratered
you couldn't have cratered
they couldn't have cratered	I couldn't have been cratering
you couldn't have been cratering
he couldn't have been cratering
we couldn't have been cratering
you couldn't have been cratering
they couldn't have been cratering	

Forma interrogativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
could I crater?
could you crater?
could he crater?
could we crater?
could you crater?
could they crater? 	could I be cratering?
could you be cratering?
could he be cratering?
could we be cratering?
could you be cratering?
could they be cratering? 	could I have cratered?
could you have cratered?
could he have cratered?
could we have cratered?
could you have cratered?
could they have cratered? 	could I have been cratering?
could you have been cratering?
could he have been cratering?
could we have been cratering?
could you have been cratering?
could they have been cratering? 	

Forma interro-negativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
couldn't I crater?
couldn't you crater?
couldn't he crater?
couldn't we crater?
couldn't you crater?
couldn't they crater? 	couldn't I be cratering?
couldn't you be cratering?
couldn't he be cratering?
couldn't we be cratering?
couldn't you be cratering?
couldn't they be cratering? 	couldn't I have cratered?
couldn't you have cratered?
couldn't he have cratered?
couldn't we have cratered?
couldn't you have cratered?
couldn't they have cratered? 	couldn't I have been cratering?
couldn't you have been cratering?
couldn't he have been cratering?
couldn't we have been cratering?
couldn't you have been cratering?
couldn't they have been cratering?