must underestimate
Verbe régulier : underestimate - underestimated- underestimated
Traduction française : sous-estimer - mésestimer 

Affirmation 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
I must underestimate
you must underestimate
he must underestimate
we must underestimate
you must underestimate
they must underestimate 	I must be underestimating
you must be underestimating
he must be underestimating
we must be underestimating
you must be underestimating
they must be underestimating	I must have underestimated
you must have underestimated
he must have underestimated
we must have underestimated
you must have underestimated
they must have underestimated	I must have been underestimating
you must have been underestimating
he must have been underestimating
we must have been underestimating
you must have been underestimating
they must have been underestimating	

Négation 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
I must not underestimate
you must not underestimate
he must not underestimate
we must not underestimate
you must not underestimate
they must not underestimate 	I must not be underestimating
you must not be underestimating
he must not be underestimating
we must not be underestimating
you must not be underestimating
they must not be underestimating	I must not have underestimated
you must not have underestimated
he must not have underestimated
we must not have underestimated
you must not have underestimated
they must not have underestimated	I must not have been underestimating
you must not have been underestimating
he must not have been underestimating
we must not have been underestimating
you must not have been underestimating
they must not have been underestimating	

Forme interrogative 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
must I underestimate?
must you underestimate?
must he underestimate?
must we underestimate?
must you underestimate?
must they underestimate? 	must I be underestimating?
must you be underestimating?
must he be underestimating?
must we be underestimating?
must you be underestimating?
must they be underestimating? 	must I have underestimated?
must you have underestimated?
must he have underestimated?
must we have underestimated?
must you have underestimated?
must they have underestimated? 	must I have been underestimating?
must you have been underestimating?
must he have been underestimating?
must we have been underestimating?
must you have been underestimating?
must they have been underestimating? 	

Forme interro-négative 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
must I not underestimate?
must you not underestimate?
must he not underestimate?
must we not underestimate?
must you not underestimate?
must they not underestimate? 	must I not be underestimating?
must you not be underestimating?
must he not be underestimating?
must we not be underestimating?
must you not be underestimating?
must they not be underestimating? 	must I not have underestimated?
must you not have underestimated?
must he not have underestimated?
must we not have underestimated?
must you not have underestimated?
must they not have underestimated? 	must I not have been underestimating?
must you not have been underestimating?
must he not have been underestimating?
must we not have been underestimating?
must you not have been underestimating?
must they not have been underestimating?