could moo
Regular verb: moo - mooed- mooed

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could moo
you could moo
she could moo
we could moo
you could moo
they could moo 	I could be mooing
you could be mooing
she could be mooing
we could be mooing
you could be mooing
they could be mooing	I could have mooed
you could have mooed
she could have mooed
we could have mooed
you could have mooed
they could have mooed	I could have been mooing
you could have been mooing
she could have been mooing
we could have been mooing
you could have been mooing
they could have been mooing	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could not moo
you could not moo
she could not moo
we could not moo
you could not moo
they could not moo 	I could not be mooing
you could not be mooing
she could not be mooing
we could not be mooing
you could not be mooing
they could not be mooing	I could not have mooed
you could not have mooed
she could not have mooed
we could not have mooed
you could not have mooed
they could not have mooed	I could not have been mooing
you could not have been mooing
she could not have been mooing
we could not have been mooing
you could not have been mooing
they could not have been mooing	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I moo?
could you moo?
could she moo?
could we moo?
could you moo?
could they moo? 	could I be mooing?
could you be mooing?
could she be mooing?
could we be mooing?
could you be mooing?
could they be mooing? 	could I have mooed?
could you have mooed?
could she have mooed?
could we have mooed?
could you have mooed?
could they have mooed? 	could I have been mooing?
could you have been mooing?
could she have been mooing?
could we have been mooing?
could you have been mooing?
could they have been mooing? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I not moo?
could you not moo?
could she not moo?
could we not moo?
could you not moo?
could they not moo? 	could I not be mooing?
could you not be mooing?
could she not be mooing?
could we not be mooing?
could you not be mooing?
could they not be mooing? 	could I not have mooed?
could you not have mooed?
could she not have mooed?
could we not have mooed?
could you not have mooed?
could they not have mooed? 	could I not have been mooing?
could you not have been mooing?
could she not have been mooing?
could we not have been mooing?
could you not have been mooing?
could they not have been mooing?