must unclench
Verbo regular: unclench - unclenched- unclenched

Afirmación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I must unclench
you must unclench
she must unclench
we must unclench
you must unclench
they must unclench 	I must be unclenching
you must be unclenching
she must be unclenching
we must be unclenching
you must be unclenching
they must be unclenching	I must have unclenched
you must have unclenched
she must have unclenched
we must have unclenched
you must have unclenched
they must have unclenched	I must have been unclenching
you must have been unclenching
she must have been unclenching
we must have been unclenching
you must have been unclenching
they must have been unclenching	

Negación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I must not unclench
you must not unclench
she must not unclench
we must not unclench
you must not unclench
they must not unclench 	I must not be unclenching
you must not be unclenching
she must not be unclenching
we must not be unclenching
you must not be unclenching
they must not be unclenching	I must not have unclenched
you must not have unclenched
she must not have unclenched
we must not have unclenched
you must not have unclenched
they must not have unclenched	I must not have been unclenching
you must not have been unclenching
she must not have been unclenching
we must not have been unclenching
you must not have been unclenching
they must not have been unclenching	

Forma interrogativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
must I unclench?
must you unclench?
must she unclench?
must we unclench?
must you unclench?
must they unclench? 	must I be unclenching?
must you be unclenching?
must she be unclenching?
must we be unclenching?
must you be unclenching?
must they be unclenching? 	must I have unclenched?
must you have unclenched?
must she have unclenched?
must we have unclenched?
must you have unclenched?
must they have unclenched? 	must I have been unclenching?
must you have been unclenching?
must she have been unclenching?
must we have been unclenching?
must you have been unclenching?
must they have been unclenching? 	

Forma interro-negativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
must I not unclench?
must you not unclench?
must she not unclench?
must we not unclench?
must you not unclench?
must they not unclench? 	must I not be unclenching?
must you not be unclenching?
must she not be unclenching?
must we not be unclenching?
must you not be unclenching?
must they not be unclenching? 	must I not have unclenched?
must you not have unclenched?
must she not have unclenched?
must we not have unclenched?
must you not have unclenched?
must they not have unclenched? 	must I not have been unclenching?
must you not have been unclenching?
must she not have been unclenching?
must we not have been unclenching?
must you not have been unclenching?
must they not have been unclenching?