can button
Verbo regular: button - buttoned- buttoned

Afirmação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I can button
you can button
he can button
we can button
you can button
they can button 	I can be buttoning
you can be buttoning
he can be buttoning
we can be buttoning
you can be buttoning
they can be buttoning	I can have buttoned
you can have buttoned
he can have buttoned
we can have buttoned
you can have buttoned
they can have buttoned	I can have been buttoning
you can have been buttoning
he can have been buttoning
we can have been buttoning
you can have been buttoning
they can have been buttoning	

Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I can't button
you can't button
he can't button
we can't button
you can't button
they can't button 	I can't be buttoning
you can't be buttoning
he can't be buttoning
we can't be buttoning
you can't be buttoning
they can't be buttoning	I can't have buttoned
you can't have buttoned
he can't have buttoned
we can't have buttoned
you can't have buttoned
they can't have buttoned	I can't have been buttoning
you can't have been buttoning
he can't have been buttoning
we can't have been buttoning
you can't have been buttoning
they can't have been buttoning	

Forma interrogativa 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
can I button?
can you button?
can he button?
can we button?
can you button?
can they button? 	can I be buttoning?
can you be buttoning?
can he be buttoning?
can we be buttoning?
can you be buttoning?
can they be buttoning? 	can I have buttoned?
can you have buttoned?
can he have buttoned?
can we have buttoned?
can you have buttoned?
can they have buttoned? 	can I have been buttoning?
can you have been buttoning?
can he have been buttoning?
can we have been buttoning?
can you have been buttoning?
can they have been buttoning? 	

Forma interro-Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
can't I button?
can't you button?
can't he button?
can't we button?
can't you button?
can't they button? 	can't I be buttoning?
can't you be buttoning?
can't he be buttoning?
can't we be buttoning?
can't you be buttoning?
can't they be buttoning? 	can't I have buttoned?
can't you have buttoned?
can't he have buttoned?
can't we have buttoned?
can't you have buttoned?
can't they have buttoned? 	can't I have been buttoning?
can't you have been buttoning?
can't he have been buttoning?
can't we have been buttoning?
can't you have been buttoning?
can't they have been buttoning?