English verb conjugation
COULD BUTTERFLY

Regular verb: butterfly - butterflied - butterflied

Affirmation

Simple form	V-ing form
I could butterfly you could butterfly he could butterfly we could butterfly you could butterfly they could butterfly	I could be butterflying you could be butterflying he could be butterflying we could be butterflying you could be butterflying they could be butterflying
Perfect	V-ing perfect
I could have butterflied you could have butterflied he 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 he 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
I could not butterfly you could not butterfly he could not butterfly we could not butterfly you could not butterfly they could not butterfly	I could not be butterflying you could not be butterflying he could not be butterflying we could not be butterflying you could not be butterflying they could not be butterflying
Perfect	V-ing perfect
I could not have butterflied you could not have butterflied he could not have butterflied we could not have butterflied you could not have butterflied they could not have butterflied	I could not have been butterflying you could not have been butterflying he could not have been butterflying we could not have been butterflying you could not have been butterflying they could not have been butterflying

Interrogative form

Simple form	V-ing form
could I butterfly? could you butterfly? could he butterfly? could we butterfly? could you butterfly? could they butterfly?	could I be butterflying? could you be butterflying? could he be butterflying? could we be butterflying? could you be butterflying? could they be butterflying?
Perfect	V-ing perfect
could I have butterflied? could you have butterflied? could he 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 he 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
could I not butterfly? could you not butterfly? could he not butterfly? could we not butterfly? could you not butterfly? could they not butterfly?	could I not be butterflying? could you not be butterflying? could he not be butterflying? could we not be butterflying? could you not be butterflying? could they not be butterflying?
Perfect	V-ing perfect
could I not have butterflied? could you not have butterflied? could he not have butterflied? could we not have butterflied? could you not have butterflied? could they not have butterflied?	could I not have been butterflying? could you not have been butterflying? could he not have been butterflying? could we not have been butterflying? could you not have been butterflying? could they not have been butterflying?