English verb conjugation
MUST FLUNK

Regular verb: flunk - flunked - flunked

Affirmation

Simple form	V-ing form
I must flunk you must flunk he must flunk we must flunk you must flunk they must flunk	I must be flunking you must be flunking he must be flunking we must be flunking you must be flunking they must be flunking
Perfect	V-ing perfect
I must have flunked you must have flunked he must have flunked we must have flunked you must have flunked they must have flunked	I must have been flunking you must have been flunking he must have been flunking we must have been flunking you must have been flunking they must have been flunking

Negation

Simple form	V-ing form
I mustn't flunk you mustn't flunk he mustn't flunk we mustn't flunk you mustn't flunk they mustn't flunk	I mustn't be flunking you mustn't be flunking he mustn't be flunking we mustn't be flunking you mustn't be flunking they mustn't be flunking
Perfect	V-ing perfect
I mustn't have flunked you mustn't have flunked he mustn't have flunked we mustn't have flunked you mustn't have flunked they mustn't have flunked	I mustn't have been flunking you mustn't have been flunking he mustn't have been flunking we mustn't have been flunking you mustn't have been flunking they mustn't have been flunking

Interrogative form

Simple form	V-ing form
must I flunk? must you flunk? must he flunk? must we flunk? must you flunk? must they flunk?	must I be flunking? must you be flunking? must he be flunking? must we be flunking? must you be flunking? must they be flunking?
Perfect	V-ing perfect
must I have flunked? must you have flunked? must he have flunked? must we have flunked? must you have flunked? must they have flunked?	must I have been flunking? must you have been flunking? must he have been flunking? must we have been flunking? must you have been flunking? must they have been flunking?

Interro-negative form

Simple form	V-ing form
mustn't I flunk? mustn't you flunk? mustn't he flunk? mustn't we flunk? mustn't you flunk? mustn't they flunk?	mustn't I be flunking? mustn't you be flunking? mustn't he be flunking? mustn't we be flunking? mustn't you be flunking? mustn't they be flunking?
Perfect	V-ing perfect
mustn't I have flunked? mustn't you have flunked? mustn't he have flunked? mustn't we have flunked? mustn't you have flunked? mustn't they have flunked?	mustn't I have been flunking? mustn't you have been flunking? mustn't he have been flunking? mustn't we have been flunking? mustn't you have been flunking? mustn't they have been flunking?