English verb conjugation
MUST FLUB

Regular verb: flub - flubed - flubed

Affirmation

Simple form	V-ing form
I must flub you must flub he must flub we must flub you must flub they must flub	I must be flubing you must be flubing he must be flubing we must be flubing you must be flubing they must be flubing
Perfect	V-ing perfect
I must have flubed you must have flubed he must have flubed we must have flubed you must have flubed they must have flubed	I must have been flubing you must have been flubing he must have been flubing we must have been flubing you must have been flubing they must have been flubing

Negation

Simple form	V-ing form
I mustn't flub you mustn't flub he mustn't flub we mustn't flub you mustn't flub they mustn't flub	I mustn't be flubing you mustn't be flubing he mustn't be flubing we mustn't be flubing you mustn't be flubing they mustn't be flubing
Perfect	V-ing perfect
I mustn't have flubed you mustn't have flubed he mustn't have flubed we mustn't have flubed you mustn't have flubed they mustn't have flubed	I mustn't have been flubing you mustn't have been flubing he mustn't have been flubing we mustn't have been flubing you mustn't have been flubing they mustn't have been flubing

Interrogative form

Simple form	V-ing form
must I flub? must you flub? must he flub? must we flub? must you flub? must they flub?	must I be flubing? must you be flubing? must he be flubing? must we be flubing? must you be flubing? must they be flubing?
Perfect	V-ing perfect
must I have flubed? must you have flubed? must he have flubed? must we have flubed? must you have flubed? must they have flubed?	must I have been flubing? must you have been flubing? must he have been flubing? must we have been flubing? must you have been flubing? must they have been flubing?

Interro-negative form

Simple form	V-ing form
mustn't I flub? mustn't you flub? mustn't he flub? mustn't we flub? mustn't you flub? mustn't they flub?	mustn't I be flubing? mustn't you be flubing? mustn't he be flubing? mustn't we be flubing? mustn't you be flubing? mustn't they be flubing?
Perfect	V-ing perfect
mustn't I have flubed? mustn't you have flubed? mustn't he have flubed? mustn't we have flubed? mustn't you have flubed? mustn't they have flubed?	mustn't I have been flubing? mustn't you have been flubing? mustn't he have been flubing? mustn't we have been flubing? mustn't you have been flubing? mustn't they have been flubing?