must understeer
Verbe régulier : understeer - understeered- understeered

Affirmation 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
I must understeer
you must understeer
he must understeer
we must understeer
you must understeer
they must understeer 	I must be understeering
you must be understeering
he must be understeering
we must be understeering
you must be understeering
they must be understeering	I must have understeered
you must have understeered
he must have understeered
we must have understeered
you must have understeered
they must have understeered	I must have been understeering
you must have been understeering
he must have been understeering
we must have been understeering
you must have been understeering
they must have been understeering	

Négation 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
I must not understeer
you must not understeer
he must not understeer
we must not understeer
you must not understeer
they must not understeer 	I must not be understeering
you must not be understeering
he must not be understeering
we must not be understeering
you must not be understeering
they must not be understeering	I must not have understeered
you must not have understeered
he must not have understeered
we must not have understeered
you must not have understeered
they must not have understeered	I must not have been understeering
you must not have been understeering
he must not have been understeering
we must not have been understeering
you must not have been understeering
they must not have been understeering	

Forme interrogative 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
must I understeer?
must you understeer?
must he understeer?
must we understeer?
must you understeer?
must they understeer? 	must I be understeering?
must you be understeering?
must he be understeering?
must we be understeering?
must you be understeering?
must they be understeering? 	must I have understeered?
must you have understeered?
must he have understeered?
must we have understeered?
must you have understeered?
must they have understeered? 	must I have been understeering?
must you have been understeering?
must he have been understeering?
must we have been understeering?
must you have been understeering?
must they have been understeering? 	

Forme interro-négative 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
must I not understeer?
must you not understeer?
must he not understeer?
must we not understeer?
must you not understeer?
must they not understeer? 	must I not be understeering?
must you not be understeering?
must he not be understeering?
must we not be understeering?
must you not be understeering?
must they not be understeering? 	must I not have understeered?
must you not have understeered?
must he not have understeered?
must we not have understeered?
must you not have understeered?
must they not have understeered? 	must I not have been understeering?
must you not have been understeering?
must he not have been understeering?
must we not have been understeering?
must you not have been understeering?
must they not have been understeering?