must retrofit
Verbe irrégulier : retrofit - retrofit- retrofit

Affirmation 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
I must retrofit
you must retrofit
he must retrofit
we must retrofit
you must retrofit
they must retrofit 	I must be retrofiting
you must be retrofiting
he must be retrofiting
we must be retrofiting
you must be retrofiting
they must be retrofiting	I must have retrofit
you must have retrofit
he must have retrofit
we must have retrofit
you must have retrofit
they must have retrofit	I must have been retrofiting
you must have been retrofiting
he must have been retrofiting
we must have been retrofiting
you must have been retrofiting
they must have been retrofiting	

Négation 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
I mustn't retrofit
you mustn't retrofit
he mustn't retrofit
we mustn't retrofit
you mustn't retrofit
they mustn't retrofit 	I mustn't be retrofiting
you mustn't be retrofiting
he mustn't be retrofiting
we mustn't be retrofiting
you mustn't be retrofiting
they mustn't be retrofiting	I mustn't have retrofit
you mustn't have retrofit
he mustn't have retrofit
we mustn't have retrofit
you mustn't have retrofit
they mustn't have retrofit	I mustn't have been retrofiting
you mustn't have been retrofiting
he mustn't have been retrofiting
we mustn't have been retrofiting
you mustn't have been retrofiting
they mustn't have been retrofiting	

Forme interrogative 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
must I retrofit?
must you retrofit?
must he retrofit?
must we retrofit?
must you retrofit?
must they retrofit? 	must I be retrofiting?
must you be retrofiting?
must he be retrofiting?
must we be retrofiting?
must you be retrofiting?
must they be retrofiting? 	must I have retrofit?
must you have retrofit?
must he have retrofit?
must we have retrofit?
must you have retrofit?
must they have retrofit? 	must I have been retrofiting?
must you have been retrofiting?
must he have been retrofiting?
must we have been retrofiting?
must you have been retrofiting?
must they have been retrofiting? 	

Forme interro-négative 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
mustn't I retrofit?
mustn't you retrofit?
mustn't he retrofit?
mustn't we retrofit?
mustn't you retrofit?
mustn't they retrofit? 	mustn't I be retrofiting?
mustn't you be retrofiting?
mustn't he be retrofiting?
mustn't we be retrofiting?
mustn't you be retrofiting?
mustn't they be retrofiting? 	mustn't I have retrofit?
mustn't you have retrofit?
mustn't he have retrofit?
mustn't we have retrofit?
mustn't you have retrofit?
mustn't they have retrofit? 	mustn't I have been retrofiting?
mustn't you have been retrofiting?
mustn't he have been retrofiting?
mustn't we have been retrofiting?
mustn't you have been retrofiting?
mustn't they have been retrofiting?