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