must sire
Verbe régulier : sire - sired- sired
Traduction française : engendrer 

Affirmation 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
I must sire
you must sire
he must sire
we must sire
you must sire
they must sire 	I must be siring
you must be siring
he must be siring
we must be siring
you must be siring
they must be siring	I must have sired
you must have sired
he must have sired
we must have sired
you must have sired
they must have sired	I must have been siring
you must have been siring
he must have been siring
we must have been siring
you must have been siring
they must have been siring	

Négation 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
I mustn't sire
you mustn't sire
he mustn't sire
we mustn't sire
you mustn't sire
they mustn't sire 	I mustn't be siring
you mustn't be siring
he mustn't be siring
we mustn't be siring
you mustn't be siring
they mustn't be siring	I mustn't have sired
you mustn't have sired
he mustn't have sired
we mustn't have sired
you mustn't have sired
they mustn't have sired	I mustn't have been siring
you mustn't have been siring
he mustn't have been siring
we mustn't have been siring
you mustn't have been siring
they mustn't have been siring	

Forme interrogative 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
must I sire?
must you sire?
must he sire?
must we sire?
must you sire?
must they sire? 	must I be siring?
must you be siring?
must he be siring?
must we be siring?
must you be siring?
must they be siring? 	must I have sired?
must you have sired?
must he have sired?
must we have sired?
must you have sired?
must they have sired? 	must I have been siring?
must you have been siring?
must he have been siring?
must we have been siring?
must you have been siring?
must they have been siring? 	

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