could skipper
Regular verb: skipper - skippered- skippered

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could skipper
you could skipper
she could skipper
we could skipper
you could skipper
they could skipper 	I could be skippering
you could be skippering
she could be skippering
we could be skippering
you could be skippering
they could be skippering	I could have skippered
you could have skippered
she could have skippered
we could have skippered
you could have skippered
they could have skippered	I could have been skippering
you could have been skippering
she could have been skippering
we could have been skippering
you could have been skippering
they could have been skippering	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could not skipper
you could not skipper
she could not skipper
we could not skipper
you could not skipper
they could not skipper 	I could not be skippering
you could not be skippering
she could not be skippering
we could not be skippering
you could not be skippering
they could not be skippering	I could not have skippered
you could not have skippered
she could not have skippered
we could not have skippered
you could not have skippered
they could not have skippered	I could not have been skippering
you could not have been skippering
she could not have been skippering
we could not have been skippering
you could not have been skippering
they could not have been skippering	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I skipper?
could you skipper?
could she skipper?
could we skipper?
could you skipper?
could they skipper? 	could I be skippering?
could you be skippering?
could she be skippering?
could we be skippering?
could you be skippering?
could they be skippering? 	could I have skippered?
could you have skippered?
could she have skippered?
could we have skippered?
could you have skippered?
could they have skippered? 	could I have been skippering?
could you have been skippering?
could she have been skippering?
could we have been skippering?
could you have been skippering?
could they have been skippering? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I not skipper?
could you not skipper?
could she not skipper?
could we not skipper?
could you not skipper?
could they not skipper? 	could I not be skippering?
could you not be skippering?
could she not be skippering?
could we not be skippering?
could you not be skippering?
could they not be skippering? 	could I not have skippered?
could you not have skippered?
could she not have skippered?
could we not have skippered?
could you not have skippered?
could they not have skippered? 	could I not have been skippering?
could you not have been skippering?
could she not have been skippering?
could we not have been skippering?
could you not have been skippering?
could they not have been skippering?