English verb conjugation
COULD BUTTONHOLE

Regular verb: buttonhole - buttonholed - buttonholed

Affirmation

Simple form	V-ing form
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
Perfect	V-ing perfect
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

Negation

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

Interrogative form

Simple form	V-ing form
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?
Perfect	V-ing perfect
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?

Interro-negative form

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