must countermine
Verbe régulier : countermine - countermined- countermined

Affirmation 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
I must countermine
you must countermine
he must countermine
we must countermine
you must countermine
they must countermine 	I must be countermining
you must be countermining
he must be countermining
we must be countermining
you must be countermining
they must be countermining	I must have countermined
you must have countermined
he must have countermined
we must have countermined
you must have countermined
they must have countermined	I must have been countermining
you must have been countermining
he must have been countermining
we must have been countermining
you must have been countermining
they must have been countermining	

Négation 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
I mustn't countermine
you mustn't countermine
he mustn't countermine
we mustn't countermine
you mustn't countermine
they mustn't countermine 	I mustn't be countermining
you mustn't be countermining
he mustn't be countermining
we mustn't be countermining
you mustn't be countermining
they mustn't be countermining	I mustn't have countermined
you mustn't have countermined
he mustn't have countermined
we mustn't have countermined
you mustn't have countermined
they mustn't have countermined	I mustn't have been countermining
you mustn't have been countermining
he mustn't have been countermining
we mustn't have been countermining
you mustn't have been countermining
they mustn't have been countermining	

Forme interrogative 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
must I countermine?
must you countermine?
must he countermine?
must we countermine?
must you countermine?
must they countermine? 	must I be countermining?
must you be countermining?
must he be countermining?
must we be countermining?
must you be countermining?
must they be countermining? 	must I have countermined?
must you have countermined?
must he have countermined?
must we have countermined?
must you have countermined?
must they have countermined? 	must I have been countermining?
must you have been countermining?
must he have been countermining?
must we have been countermining?
must you have been countermining?
must they have been countermining? 	

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