could buttonhole
Verbo regular: buttonhole - buttonholed- buttonholed

Afirmación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I could buttonhole
you could buttonhole
she could buttonhole
we could buttonhole
you could buttonhole
they could buttonhole 	I could be buttonholing
you could be buttonholing
she could be buttonholing
we could be buttonholing
you could be buttonholing
they could be buttonholing	I could have buttonholed
you could have buttonholed
she could have buttonholed
we could have buttonholed
you could have buttonholed
they could have buttonholed	I could have been buttonholing
you could have been buttonholing
she could have been buttonholing
we could have been buttonholing
you could have been buttonholing
they could have been buttonholing	

Negación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I could not buttonhole
you could not buttonhole
she could not buttonhole
we could not buttonhole
you could not buttonhole
they could not buttonhole 	I could not be buttonholing
you could not be buttonholing
she could not be buttonholing
we could not be buttonholing
you could not be buttonholing
they could not be buttonholing	I could not have buttonholed
you could not have buttonholed
she could not have buttonholed
we could not have buttonholed
you could not have buttonholed
they could not have buttonholed	I could not have been buttonholing
you could not have been buttonholing
she could not have been buttonholing
we could not have been buttonholing
you could not have been buttonholing
they could not have been buttonholing	

Forma interrogativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
could I buttonhole?
could you buttonhole?
could she buttonhole?
could we buttonhole?
could you buttonhole?
could they buttonhole? 	could I be buttonholing?
could you be buttonholing?
could she be buttonholing?
could we be buttonholing?
could you be buttonholing?
could they be buttonholing? 	could I have buttonholed?
could you have buttonholed?
could she have buttonholed?
could we have buttonholed?
could you have buttonholed?
could they have buttonholed? 	could I have been buttonholing?
could you have been buttonholing?
could she have been buttonholing?
could we have been buttonholing?
could you have been buttonholing?
could they have been buttonholing? 	

Forma interro-negativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
could I not buttonhole?
could you not buttonhole?
could she not buttonhole?
could we not buttonhole?
could you not buttonhole?
could they not buttonhole? 	could I not be buttonholing?
could you not be buttonholing?
could she not be buttonholing?
could we not be buttonholing?
could you not be buttonholing?
could they not be buttonholing? 	could I not have buttonholed?
could you not have buttonholed?
could she not have buttonholed?
could we not have buttonholed?
could you not have buttonholed?
could they not have buttonholed? 	could I not have been buttonholing?
could you not have been buttonholing?
could she not have been buttonholing?
could we not have been buttonholing?
could you not have been buttonholing?
could they not have been buttonholing?