English verb conjugation
CAN BUTTONHOLE

Regular verb: buttonhole - buttonholed - buttonholed

Affirmation

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