must underlie
Verbo irregular: underlie - underlay- underlain

Afirmación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I must underlie
you must underlie
he must underlie
we must underlie
you must underlie
they must underlie 	I must be underlying
you must be underlying
he must be underlying
we must be underlying
you must be underlying
they must be underlying	I must have underlain
you must have underlain
he 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
he must have been underlying
we must have been underlying
you must have been underlying
they must have been underlying	

Negación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I must not underlie
you must not underlie
he 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
he 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
he 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
he must not have been underlying
we must not have been underlying
you must not have been underlying
they must not have been underlying	

Forma interrogativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
must I underlie?
must you underlie?
must he underlie?
must we underlie?
must you underlie?
must they underlie? 	must I be underlying?
must you be underlying?
must he be underlying?
must we be underlying?
must you be underlying?
must they be underlying? 	must I have underlain?
must you have underlain?
must he 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 he have been underlying?
must we have been underlying?
must you have been underlying?
must they have been underlying? 	

Forma interro-negativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
must I not underlie?
must you not underlie?
must he 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 he 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 he 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 he not have been underlying?
must we not have been underlying?
must you not have been underlying?
must they not have been underlying?