could blub
Regular verb: blub - blubed- blubed

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could blub
you could blub
he could blub
we could blub
you could blub
they could blub 	I could be blubing
you could be blubing
he could be blubing
we could be blubing
you could be blubing
they could be blubing	I could have blubed
you could have blubed
he could have blubed
we could have blubed
you could have blubed
they could have blubed	I could have been blubing
you could have been blubing
he could have been blubing
we could have been blubing
you could have been blubing
they could have been blubing	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I couldn't blub
you couldn't blub
he couldn't blub
we couldn't blub
you couldn't blub
they couldn't blub 	I couldn't be blubing
you couldn't be blubing
he couldn't be blubing
we couldn't be blubing
you couldn't be blubing
they couldn't be blubing	I couldn't have blubed
you couldn't have blubed
he couldn't have blubed
we couldn't have blubed
you couldn't have blubed
they couldn't have blubed	I couldn't have been blubing
you couldn't have been blubing
he couldn't have been blubing
we couldn't have been blubing
you couldn't have been blubing
they couldn't have been blubing	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I blub?
could you blub?
could he blub?
could we blub?
could you blub?
could they blub? 	could I be blubing?
could you be blubing?
could he be blubing?
could we be blubing?
could you be blubing?
could they be blubing? 	could I have blubed?
could you have blubed?
could he have blubed?
could we have blubed?
could you have blubed?
could they have blubed? 	could I have been blubing?
could you have been blubing?
could he have been blubing?
could we have been blubing?
could you have been blubing?
could they have been blubing? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
couldn't I blub?
couldn't you blub?
couldn't he blub?
couldn't we blub?
couldn't you blub?
couldn't they blub? 	couldn't I be blubing?
couldn't you be blubing?
couldn't he be blubing?
couldn't we be blubing?
couldn't you be blubing?
couldn't they be blubing? 	couldn't I have blubed?
couldn't you have blubed?
couldn't he have blubed?
couldn't we have blubed?
couldn't you have blubed?
couldn't they have blubed? 	couldn't I have been blubing?
couldn't you have been blubing?
couldn't he have been blubing?
couldn't we have been blubing?
couldn't you have been blubing?
couldn't they have been blubing?