must jack
Verbo regular: jack - jacked- jacked

Afirmación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I must jack
you must jack
he must jack
we must jack
you must jack
they must jack 	I must be jacking
you must be jacking
he must be jacking
we must be jacking
you must be jacking
they must be jacking	I must have jacked
you must have jacked
he must have jacked
we must have jacked
you must have jacked
they must have jacked	I must have been jacking
you must have been jacking
he must have been jacking
we must have been jacking
you must have been jacking
they must have been jacking	

Negación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I must not jack
you must not jack
he must not jack
we must not jack
you must not jack
they must not jack 	I must not be jacking
you must not be jacking
he must not be jacking
we must not be jacking
you must not be jacking
they must not be jacking	I must not have jacked
you must not have jacked
he must not have jacked
we must not have jacked
you must not have jacked
they must not have jacked	I must not have been jacking
you must not have been jacking
he must not have been jacking
we must not have been jacking
you must not have been jacking
they must not have been jacking	

Forma interrogativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
must I jack?
must you jack?
must he jack?
must we jack?
must you jack?
must they jack? 	must I be jacking?
must you be jacking?
must he be jacking?
must we be jacking?
must you be jacking?
must they be jacking? 	must I have jacked?
must you have jacked?
must he have jacked?
must we have jacked?
must you have jacked?
must they have jacked? 	must I have been jacking?
must you have been jacking?
must he have been jacking?
must we have been jacking?
must you have been jacking?
must they have been jacking? 	

Forma interro-negativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
must I not jack?
must you not jack?
must he not jack?
must we not jack?
must you not jack?
must they not jack? 	must I not be jacking?
must you not be jacking?
must he not be jacking?
must we not be jacking?
must you not be jacking?
must they not be jacking? 	must I not have jacked?
must you not have jacked?
must he not have jacked?
must we not have jacked?
must you not have jacked?
must they not have jacked? 	must I not have been jacking?
must you not have been jacking?
must he not have been jacking?
must we not have been jacking?
must you not have been jacking?
must they not have been jacking?