must underlie
Verbe irrégulier : underlie - underlay- underlain
Traduction française : sous-tendre - être à la base de 

Affirmation 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
I must underlie
you must underlie
she must underlie
we must underlie
you must underlie
they must underlie 	I must be underlying
you must be underlying
she must be underlying
we must be underlying
you must be underlying
they must be underlying	I must have underlain
you must have underlain
she must have underlain
we must have underlain
you must have underlain
they must have underlain	I must have been underlying
you must have been underlying
she must have been underlying
we must have been underlying
you must have been underlying
they must have been underlying	

Négation 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
I must not underlie
you must not underlie
she must not underlie
we must not underlie
you must not underlie
they must not underlie 	I must not be underlying
you must not be underlying
she must not be underlying
we must not be underlying
you must not be underlying
they must not be underlying	I must not have underlain
you must not have underlain
she must not have underlain
we must not have underlain
you must not have underlain
they must not have underlain	I must not have been underlying
you must not have been underlying
she must not have been underlying
we must not have been underlying
you must not have been underlying
they must not have been underlying	

Forme interrogative 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
must I underlie?
must you underlie?
must she underlie?
must we underlie?
must you underlie?
must they underlie? 	must I be underlying?
must you be underlying?
must she be underlying?
must we be underlying?
must you be underlying?
must they be underlying? 	must I have underlain?
must you have underlain?
must she have underlain?
must we have underlain?
must you have underlain?
must they have underlain? 	must I have been underlying?
must you have been underlying?
must she have been underlying?
must we have been underlying?
must you have been underlying?
must they have been underlying? 	

Forme interro-négative 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
must I not underlie?
must you not underlie?
must she not underlie?
must we not underlie?
must you not underlie?
must they not underlie? 	must I not be underlying?
must you not be underlying?
must she not be underlying?
must we not be underlying?
must you not be underlying?
must they not be underlying? 	must I not have underlain?
must you not have underlain?
must she not have underlain?
must we not have underlain?
must you not have underlain?
must they not have underlain? 	must I not have been underlying?
must you not have been underlying?
must she not have been underlying?
must we not have been underlying?
must you not have been underlying?
must they not have been underlying?