must sack
Verbo regular: sack - sacked- sacked

Afirmación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I must sack
you must sack
he must sack
we must sack
you must sack
they must sack 	I must be sacking
you must be sacking
he must be sacking
we must be sacking
you must be sacking
they must be sacking	I must have sacked
you must have sacked
he must have sacked
we must have sacked
you must have sacked
they must have sacked	I must have been sacking
you must have been sacking
he must have been sacking
we must have been sacking
you must have been sacking
they must have been sacking	

Negación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I must not sack
you must not sack
he must not sack
we must not sack
you must not sack
they must not sack 	I must not be sacking
you must not be sacking
he must not be sacking
we must not be sacking
you must not be sacking
they must not be sacking	I must not have sacked
you must not have sacked
he must not have sacked
we must not have sacked
you must not have sacked
they must not have sacked	I must not have been sacking
you must not have been sacking
he must not have been sacking
we must not have been sacking
you must not have been sacking
they must not have been sacking	

Forma interrogativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
must I sack?
must you sack?
must he sack?
must we sack?
must you sack?
must they sack? 	must I be sacking?
must you be sacking?
must he be sacking?
must we be sacking?
must you be sacking?
must they be sacking? 	must I have sacked?
must you have sacked?
must he have sacked?
must we have sacked?
must you have sacked?
must they have sacked? 	must I have been sacking?
must you have been sacking?
must he have been sacking?
must we have been sacking?
must you have been sacking?
must they have been sacking? 	

Forma interro-negativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
must I not sack?
must you not sack?
must he not sack?
must we not sack?
must you not sack?
must they not sack? 	must I not be sacking?
must you not be sacking?
must he not be sacking?
must we not be sacking?
must you not be sacking?
must they not be sacking? 	must I not have sacked?
must you not have sacked?
must he not have sacked?
must we not have sacked?
must you not have sacked?
must they not have sacked? 	must I not have been sacking?
must you not have been sacking?
must he not have been sacking?
must we not have been sacking?
must you not have been sacking?
must they not have been sacking?