must underachieve
Verbe régulier : underachieve - underachieved- underachieved
Traduction française : ne pas obtenir les résultats attendus 

Affirmation 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
I must underachieve
you must underachieve
she must underachieve
we must underachieve
you must underachieve
they must underachieve 	I must be underachieving
you must be underachieving
she must be underachieving
we must be underachieving
you must be underachieving
they must be underachieving	I must have underachieved
you must have underachieved
she must have underachieved
we must have underachieved
you must have underachieved
they must have underachieved	I must have been underachieving
you must have been underachieving
she must have been underachieving
we must have been underachieving
you must have been underachieving
they must have been underachieving	

Négation 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
I must not underachieve
you must not underachieve
she must not underachieve
we must not underachieve
you must not underachieve
they must not underachieve 	I must not be underachieving
you must not be underachieving
she must not be underachieving
we must not be underachieving
you must not be underachieving
they must not be underachieving	I must not have underachieved
you must not have underachieved
she must not have underachieved
we must not have underachieved
you must not have underachieved
they must not have underachieved	I must not have been underachieving
you must not have been underachieving
she must not have been underachieving
we must not have been underachieving
you must not have been underachieving
they must not have been underachieving	

Forme interrogative 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
must I underachieve?
must you underachieve?
must she underachieve?
must we underachieve?
must you underachieve?
must they underachieve? 	must I be underachieving?
must you be underachieving?
must she be underachieving?
must we be underachieving?
must you be underachieving?
must they be underachieving? 	must I have underachieved?
must you have underachieved?
must she have underachieved?
must we have underachieved?
must you have underachieved?
must they have underachieved? 	must I have been underachieving?
must you have been underachieving?
must she have been underachieving?
must we have been underachieving?
must you have been underachieving?
must they have been underachieving? 	

Forme interro-négative 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
must I not underachieve?
must you not underachieve?
must she not underachieve?
must we not underachieve?
must you not underachieve?
must they not underachieve? 	must I not be underachieving?
must you not be underachieving?
must she not be underachieving?
must we not be underachieving?
must you not be underachieving?
must they not be underachieving? 	must I not have underachieved?
must you not have underachieved?
must she not have underachieved?
must we not have underachieved?
must you not have underachieved?
must they not have underachieved? 	must I not have been underachieving?
must you not have been underachieving?
must she not have been underachieving?
must we not have been underachieving?
must you not have been underachieving?
must they not have been underachieving?