can buttonhole
Regular verb: buttonhole - buttonholed- buttonholed

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I can buttonhole
you can buttonhole
she can buttonhole
we can buttonhole
you can buttonhole
they can buttonhole 	I can be buttonholing
you can be buttonholing
she can be buttonholing
we can be buttonholing
you can be buttonholing
they can be buttonholing	I can have buttonholed
you can have buttonholed
she can have buttonholed
we can have buttonholed
you can have buttonholed
they can have buttonholed	I can have been buttonholing
you can have been buttonholing
she can have been buttonholing
we can have been buttonholing
you can have been buttonholing
they can have been buttonholing	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I can't buttonhole
you can't buttonhole
she can't buttonhole
we can't buttonhole
you can't buttonhole
they can't buttonhole 	I can't be buttonholing
you can't be buttonholing
she can't be buttonholing
we can't be buttonholing
you can't be buttonholing
they can't be buttonholing	I can't have buttonholed
you can't have buttonholed
she can't have buttonholed
we can't have buttonholed
you can't have buttonholed
they can't have buttonholed	I can't have been buttonholing
you can't have been buttonholing
she can't have been buttonholing
we can't have been buttonholing
you can't have been buttonholing
they can't have been buttonholing	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
can I buttonhole?
can you buttonhole?
can she buttonhole?
can we buttonhole?
can you buttonhole?
can they buttonhole? 	can I be buttonholing?
can you be buttonholing?
can she be buttonholing?
can we be buttonholing?
can you be buttonholing?
can they be buttonholing? 	can I have buttonholed?
can you have buttonholed?
can she have buttonholed?
can we have buttonholed?
can you have buttonholed?
can they have buttonholed? 	can I have been buttonholing?
can you have been buttonholing?
can she have been buttonholing?
can we have been buttonholing?
can you have been buttonholing?
can they have been buttonholing? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
can't I buttonhole?
can't you buttonhole?
can't she buttonhole?
can't we buttonhole?
can't you buttonhole?
can't they buttonhole? 	can't I be buttonholing?
can't you be buttonholing?
can't she be buttonholing?
can't we be buttonholing?
can't you be buttonholing?
can't they be buttonholing? 	can't I have buttonholed?
can't you have buttonholed?
can't she have buttonholed?
can't we have buttonholed?
can't you have buttonholed?
can't they have buttonholed? 	can't I have been buttonholing?
can't you have been buttonholing?
can't she have been buttonholing?
can't we have been buttonholing?
can't you have been buttonholing?
can't they have been buttonholing?