could flub
Regular verb: flub - flubed- flubed

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could flub
you could flub
he could flub
we could flub
you could flub
they could flub 	I could be flubing
you could be flubing
he could be flubing
we could be flubing
you could be flubing
they could be flubing	I could have flubed
you could have flubed
he could have flubed
we could have flubed
you could have flubed
they could have flubed	I could have been flubing
you could have been flubing
he could have been flubing
we could have been flubing
you could have been flubing
they could have been flubing	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I couldn't flub
you couldn't flub
he couldn't flub
we couldn't flub
you couldn't flub
they couldn't flub 	I couldn't be flubing
you couldn't be flubing
he couldn't be flubing
we couldn't be flubing
you couldn't be flubing
they couldn't be flubing	I couldn't have flubed
you couldn't have flubed
he couldn't have flubed
we couldn't have flubed
you couldn't have flubed
they couldn't have flubed	I couldn't have been flubing
you couldn't have been flubing
he couldn't have been flubing
we couldn't have been flubing
you couldn't have been flubing
they couldn't have been flubing	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I flub?
could you flub?
could he flub?
could we flub?
could you flub?
could they flub? 	could I be flubing?
could you be flubing?
could he be flubing?
could we be flubing?
could you be flubing?
could they be flubing? 	could I have flubed?
could you have flubed?
could he have flubed?
could we have flubed?
could you have flubed?
could they have flubed? 	could I have been flubing?
could you have been flubing?
could he have been flubing?
could we have been flubing?
could you have been flubing?
could they have been flubing? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
couldn't I flub?
couldn't you flub?
couldn't he flub?
couldn't we flub?
couldn't you flub?
couldn't they flub? 	couldn't I be flubing?
couldn't you be flubing?
couldn't he be flubing?
couldn't we be flubing?
couldn't you be flubing?
couldn't they be flubing? 	couldn't I have flubed?
couldn't you have flubed?
couldn't he have flubed?
couldn't we have flubed?
couldn't you have flubed?
couldn't they have flubed? 	couldn't I have been flubing?
couldn't you have been flubing?
couldn't he have been flubing?
couldn't we have been flubing?
couldn't you have been flubing?
couldn't they have been flubing?