could butterfly
Regular verb: butterfly - butterflied- butterflied

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could butterfly
you could butterfly
she could butterfly
we could butterfly
you could butterfly
they could butterfly 	I could be butterflying
you could be butterflying
she could be butterflying
we could be butterflying
you could be butterflying
they could be butterflying	I could have butterflied
you could have butterflied
she could have butterflied
we could have butterflied
you could have butterflied
they could have butterflied	I could have been butterflying
you could have been butterflying
she could have been butterflying
we could have been butterflying
you could have been butterflying
they could have been butterflying	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I couldn't butterfly
you couldn't butterfly
she couldn't butterfly
we couldn't butterfly
you couldn't butterfly
they couldn't butterfly 	I couldn't be butterflying
you couldn't be butterflying
she couldn't be butterflying
we couldn't be butterflying
you couldn't be butterflying
they couldn't be butterflying	I couldn't have butterflied
you couldn't have butterflied
she couldn't have butterflied
we couldn't have butterflied
you couldn't have butterflied
they couldn't have butterflied	I couldn't have been butterflying
you couldn't have been butterflying
she couldn't have been butterflying
we couldn't have been butterflying
you couldn't have been butterflying
they couldn't have been butterflying	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I butterfly?
could you butterfly?
could she butterfly?
could we butterfly?
could you butterfly?
could they butterfly? 	could I be butterflying?
could you be butterflying?
could she be butterflying?
could we be butterflying?
could you be butterflying?
could they be butterflying? 	could I have butterflied?
could you have butterflied?
could she have butterflied?
could we have butterflied?
could you have butterflied?
could they have butterflied? 	could I have been butterflying?
could you have been butterflying?
could she have been butterflying?
could we have been butterflying?
could you have been butterflying?
could they have been butterflying? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
couldn't I butterfly?
couldn't you butterfly?
couldn't she butterfly?
couldn't we butterfly?
couldn't you butterfly?
couldn't they butterfly? 	couldn't I be butterflying?
couldn't you be butterflying?
couldn't she be butterflying?
couldn't we be butterflying?
couldn't you be butterflying?
couldn't they be butterflying? 	couldn't I have butterflied?
couldn't you have butterflied?
couldn't she have butterflied?
couldn't we have butterflied?
couldn't you have butterflied?
couldn't they have butterflied? 	couldn't I have been butterflying?
couldn't you have been butterflying?
couldn't she have been butterflying?
couldn't we have been butterflying?
couldn't you have been butterflying?
couldn't they have been butterflying?