can button
Regular verb: button - buttoned- buttoned

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I can button
you can button
she can button
we can button
you can button
they can button 	I can be buttoning
you can be buttoning
she can be buttoning
we can be buttoning
you can be buttoning
they can be buttoning	I can have buttoned
you can have buttoned
she 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
she can have been buttoning
we can have been buttoning
you can have been buttoning
they can have been buttoning	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I can't button
you can't button
she 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
she 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
she 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
she can't have been buttoning
we can't have been buttoning
you can't have been buttoning
they can't have been buttoning	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
can I button?
can you button?
can she button?
can we button?
can you button?
can they button? 	can I be buttoning?
can you be buttoning?
can she be buttoning?
can we be buttoning?
can you be buttoning?
can they be buttoning? 	can I have buttoned?
can you have buttoned?
can she 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 she have been buttoning?
can we have been buttoning?
can you have been buttoning?
can they have been buttoning? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
can't I button?
can't you button?
can't she 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 she 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 she 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 she have been buttoning?
can't we have been buttoning?
can't you have been buttoning?
can't they have been buttoning?