must ache
Verbo regular: ache - ached- ached

Afirmación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I must ache
you must ache
he must ache
we must ache
you must ache
they must ache 	I must be aching
you must be aching
he must be aching
we must be aching
you must be aching
they must be aching	I must have ached
you must have ached
he must have ached
we must have ached
you must have ached
they must have ached	I must have been aching
you must have been aching
he must have been aching
we must have been aching
you must have been aching
they must have been aching	

Negación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I must not ache
you must not ache
he must not ache
we must not ache
you must not ache
they must not ache 	I must not be aching
you must not be aching
he must not be aching
we must not be aching
you must not be aching
they must not be aching	I must not have ached
you must not have ached
he must not have ached
we must not have ached
you must not have ached
they must not have ached	I must not have been aching
you must not have been aching
he must not have been aching
we must not have been aching
you must not have been aching
they must not have been aching	

Forma interrogativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
must I ache?
must you ache?
must he ache?
must we ache?
must you ache?
must they ache? 	must I be aching?
must you be aching?
must he be aching?
must we be aching?
must you be aching?
must they be aching? 	must I have ached?
must you have ached?
must he have ached?
must we have ached?
must you have ached?
must they have ached? 	must I have been aching?
must you have been aching?
must he have been aching?
must we have been aching?
must you have been aching?
must they have been aching? 	

Forma interro-negativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
must I not ache?
must you not ache?
must he not ache?
must we not ache?
must you not ache?
must they not ache? 	must I not be aching?
must you not be aching?
must he not be aching?
must we not be aching?
must you not be aching?
must they not be aching? 	must I not have ached?
must you not have ached?
must he not have ached?
must we not have ached?
must you not have ached?
must they not have ached? 	must I not have been aching?
must you not have been aching?
must he not have been aching?
must we not have been aching?
must you not have been aching?
must they not have been aching?