must sub
Verbe régulier : sub - subbed- subbed
Traduction française : substituer - remplacer 

Affirmation 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
I must sub
you must sub
she must sub
we must sub
you must sub
they must sub 	I must be subbing
you must be subbing
she must be subbing
we must be subbing
you must be subbing
they must be subbing	I must have subbed
you must have subbed
she must have subbed
we must have subbed
you must have subbed
they must have subbed	I must have been subbing
you must have been subbing
she must have been subbing
we must have been subbing
you must have been subbing
they must have been subbing	

Négation 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
I mustn't sub
you mustn't sub
she mustn't sub
we mustn't sub
you mustn't sub
they mustn't sub 	I mustn't be subbing
you mustn't be subbing
she mustn't be subbing
we mustn't be subbing
you mustn't be subbing
they mustn't be subbing	I mustn't have subbed
you mustn't have subbed
she mustn't have subbed
we mustn't have subbed
you mustn't have subbed
they mustn't have subbed	I mustn't have been subbing
you mustn't have been subbing
she mustn't have been subbing
we mustn't have been subbing
you mustn't have been subbing
they mustn't have been subbing	

Forme interrogative 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
must I sub?
must you sub?
must she sub?
must we sub?
must you sub?
must they sub? 	must I be subbing?
must you be subbing?
must she be subbing?
must we be subbing?
must you be subbing?
must they be subbing? 	must I have subbed?
must you have subbed?
must she have subbed?
must we have subbed?
must you have subbed?
must they have subbed? 	must I have been subbing?
must you have been subbing?
must she have been subbing?
must we have been subbing?
must you have been subbing?
must they have been subbing? 	

Forme interro-négative 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
mustn't I sub?
mustn't you sub?
mustn't she sub?
mustn't we sub?
mustn't you sub?
mustn't they sub? 	mustn't I be subbing?
mustn't you be subbing?
mustn't she be subbing?
mustn't we be subbing?
mustn't you be subbing?
mustn't they be subbing? 	mustn't I have subbed?
mustn't you have subbed?
mustn't she have subbed?
mustn't we have subbed?
mustn't you have subbed?
mustn't they have subbed? 	mustn't I have been subbing?
mustn't you have been subbing?
mustn't she have been subbing?
mustn't we have been subbing?
mustn't you have been subbing?
mustn't they have been subbing?