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 cannot button
you cannot button
she cannot button
we cannot button
you cannot button
they cannot button 	I cannot be buttoning
you cannot be buttoning
she cannot be buttoning
we cannot be buttoning
you cannot be buttoning
they cannot be buttoning	I cannot have buttoned
you cannot have buttoned
she cannot have buttoned
we cannot have buttoned
you cannot have buttoned
they cannot have buttoned	I cannot have been buttoning
you cannot have been buttoning
she cannot have been buttoning
we cannot have been buttoning
you cannot have been buttoning
they cannot 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 I not button?
can you not button?
can she not button?
can we not button?
can you not button?
can they not button? 	can I not be buttoning?
can you not be buttoning?
can she not be buttoning?
can we not be buttoning?
can you not be buttoning?
can they not be buttoning? 	can I not have buttoned?
can you not have buttoned?
can she not have buttoned?
can we not have buttoned?
can you not have buttoned?
can they not have buttoned? 	can I not have been buttoning?
can you not have been buttoning?
can she not have been buttoning?
can we not have been buttoning?
can you not have been buttoning?
can they not have been buttoning?