could crater
Regular verb: crater - cratered- cratered

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could crater
you could crater
she could crater
we could crater
you could crater
they could crater 	I could be cratering
you could be cratering
she could be cratering
we could be cratering
you could be cratering
they could be cratering	I could have cratered
you could have cratered
she 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
she could have been cratering
we could have been cratering
you could have been cratering
they could have been cratering	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I couldn't crater
you couldn't crater
she 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
she 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
she 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
she couldn't have been cratering
we couldn't have been cratering
you couldn't have been cratering
they couldn't have been cratering	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I crater?
could you crater?
could she crater?
could we crater?
could you crater?
could they crater? 	could I be cratering?
could you be cratering?
could she be cratering?
could we be cratering?
could you be cratering?
could they be cratering? 	could I have cratered?
could you have cratered?
could she 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 she have been cratering?
could we have been cratering?
could you have been cratering?
could they have been cratering? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
couldn't I crater?
couldn't you crater?
couldn't she 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 she 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 she 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 she have been cratering?
couldn't we have been cratering?
couldn't you have been cratering?
couldn't they have been cratering?