could whale
Regular verb: whale - whaled- whaled

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could whale
you could whale
she could whale
we could whale
you could whale
they could whale 	I could be whaling
you could be whaling
she could be whaling
we could be whaling
you could be whaling
they could be whaling	I could have whaled
you could have whaled
she could have whaled
we could have whaled
you could have whaled
they could have whaled	I could have been whaling
you could have been whaling
she could have been whaling
we could have been whaling
you could have been whaling
they could have been whaling	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I couldn't whale
you couldn't whale
she couldn't whale
we couldn't whale
you couldn't whale
they couldn't whale 	I couldn't be whaling
you couldn't be whaling
she couldn't be whaling
we couldn't be whaling
you couldn't be whaling
they couldn't be whaling	I couldn't have whaled
you couldn't have whaled
she couldn't have whaled
we couldn't have whaled
you couldn't have whaled
they couldn't have whaled	I couldn't have been whaling
you couldn't have been whaling
she couldn't have been whaling
we couldn't have been whaling
you couldn't have been whaling
they couldn't have been whaling	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I whale?
could you whale?
could she whale?
could we whale?
could you whale?
could they whale? 	could I be whaling?
could you be whaling?
could she be whaling?
could we be whaling?
could you be whaling?
could they be whaling? 	could I have whaled?
could you have whaled?
could she have whaled?
could we have whaled?
could you have whaled?
could they have whaled? 	could I have been whaling?
could you have been whaling?
could she have been whaling?
could we have been whaling?
could you have been whaling?
could they have been whaling? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
couldn't I whale?
couldn't you whale?
couldn't she whale?
couldn't we whale?
couldn't you whale?
couldn't they whale? 	couldn't I be whaling?
couldn't you be whaling?
couldn't she be whaling?
couldn't we be whaling?
couldn't you be whaling?
couldn't they be whaling? 	couldn't I have whaled?
couldn't you have whaled?
couldn't she have whaled?
couldn't we have whaled?
couldn't you have whaled?
couldn't they have whaled? 	couldn't I have been whaling?
couldn't you have been whaling?
couldn't she have been whaling?
couldn't we have been whaling?
couldn't you have been whaling?
couldn't they have been whaling?