English verb conjugation
MUST BUTTONHOLE

Regular verb: buttonhole - buttonholed - buttonholed

Affirmation

Simple form	V-ing form
I must buttonhole you must buttonhole he must buttonhole we must buttonhole you must buttonhole they must buttonhole	I must be buttonholing you must be buttonholing he must be buttonholing we must be buttonholing you must be buttonholing they must be buttonholing
Perfect	V-ing perfect
I must have buttonholed you must have buttonholed he must have buttonholed we must have buttonholed you must have buttonholed they must have buttonholed	I must have been buttonholing you must have been buttonholing he must have been buttonholing we must have been buttonholing you must have been buttonholing they must have been buttonholing

Negation

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

Interrogative form

Simple form	V-ing form
must I buttonhole? must you buttonhole? must he buttonhole? must we buttonhole? must you buttonhole? must they buttonhole?	must I be buttonholing? must you be buttonholing? must he be buttonholing? must we be buttonholing? must you be buttonholing? must they be buttonholing?
Perfect	V-ing perfect
must I have buttonholed? must you have buttonholed? must he have buttonholed? must we have buttonholed? must you have buttonholed? must they have buttonholed?	must I have been buttonholing? must you have been buttonholing? must he have been buttonholing? must we have been buttonholing? must you have been buttonholing? must they have been buttonholing?

Interro-negative form

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