must acknowledge
Verbo regular: acknowledge - acknowledged- acknowledged

Afirmación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I must acknowledge
you must acknowledge
she must acknowledge
we must acknowledge
you must acknowledge
they must acknowledge 	I must be acknowledging
you must be acknowledging
she must be acknowledging
we must be acknowledging
you must be acknowledging
they must be acknowledging	I must have acknowledged
you must have acknowledged
she must have acknowledged
we must have acknowledged
you must have acknowledged
they must have acknowledged	I must have been acknowledging
you must have been acknowledging
she must have been acknowledging
we must have been acknowledging
you must have been acknowledging
they must have been acknowledging	

Negación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I must not acknowledge
you must not acknowledge
she must not acknowledge
we must not acknowledge
you must not acknowledge
they must not acknowledge 	I must not be acknowledging
you must not be acknowledging
she must not be acknowledging
we must not be acknowledging
you must not be acknowledging
they must not be acknowledging	I must not have acknowledged
you must not have acknowledged
she must not have acknowledged
we must not have acknowledged
you must not have acknowledged
they must not have acknowledged	I must not have been acknowledging
you must not have been acknowledging
she must not have been acknowledging
we must not have been acknowledging
you must not have been acknowledging
they must not have been acknowledging	

Forma interrogativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
must I acknowledge?
must you acknowledge?
must she acknowledge?
must we acknowledge?
must you acknowledge?
must they acknowledge? 	must I be acknowledging?
must you be acknowledging?
must she be acknowledging?
must we be acknowledging?
must you be acknowledging?
must they be acknowledging? 	must I have acknowledged?
must you have acknowledged?
must she have acknowledged?
must we have acknowledged?
must you have acknowledged?
must they have acknowledged? 	must I have been acknowledging?
must you have been acknowledging?
must she have been acknowledging?
must we have been acknowledging?
must you have been acknowledging?
must they have been acknowledging? 	

Forma interro-negativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
must I not acknowledge?
must you not acknowledge?
must she not acknowledge?
must we not acknowledge?
must you not acknowledge?
must they not acknowledge? 	must I not be acknowledging?
must you not be acknowledging?
must she not be acknowledging?
must we not be acknowledging?
must you not be acknowledging?
must they not be acknowledging? 	must I not have acknowledged?
must you not have acknowledged?
must she not have acknowledged?
must we not have acknowledged?
must you not have acknowledged?
must they not have acknowledged? 	must I not have been acknowledging?
must you not have been acknowledging?
must she not have been acknowledging?
must we not have been acknowledging?
must you not have been acknowledging?
must they not have been acknowledging?