must flub
Regular verb: flub - flubed- flubed

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