must unjam
Regular verb: unjam - unjamed- unjamed

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must unjam
you must unjam
he must unjam
we must unjam
you must unjam
they must unjam 	I must be unjaming
you must be unjaming
he must be unjaming
we must be unjaming
you must be unjaming
they must be unjaming	I must have unjamed
you must have unjamed
he must have unjamed
we must have unjamed
you must have unjamed
they must have unjamed	I must have been unjaming
you must have been unjaming
he must have been unjaming
we must have been unjaming
you must have been unjaming
they must have been unjaming	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must not unjam
you must not unjam
he must not unjam
we must not unjam
you must not unjam
they must not unjam 	I must not be unjaming
you must not be unjaming
he must not be unjaming
we must not be unjaming
you must not be unjaming
they must not be unjaming	I must not have unjamed
you must not have unjamed
he must not have unjamed
we must not have unjamed
you must not have unjamed
they must not have unjamed	I must not have been unjaming
you must not have been unjaming
he must not have been unjaming
we must not have been unjaming
you must not have been unjaming
they must not have been unjaming	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I unjam?
must you unjam?
must he unjam?
must we unjam?
must you unjam?
must they unjam? 	must I be unjaming?
must you be unjaming?
must he be unjaming?
must we be unjaming?
must you be unjaming?
must they be unjaming? 	must I have unjamed?
must you have unjamed?
must he have unjamed?
must we have unjamed?
must you have unjamed?
must they have unjamed? 	must I have been unjaming?
must you have been unjaming?
must he have been unjaming?
must we have been unjaming?
must you have been unjaming?
must they have been unjaming? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I not unjam?
must you not unjam?
must he not unjam?
must we not unjam?
must you not unjam?
must they not unjam? 	must I not be unjaming?
must you not be unjaming?
must he not be unjaming?
must we not be unjaming?
must you not be unjaming?
must they not be unjaming? 	must I not have unjamed?
must you not have unjamed?
must he not have unjamed?
must we not have unjamed?
must you not have unjamed?
must they not have unjamed? 	must I not have been unjaming?
must you not have been unjaming?
must he not have been unjaming?
must we not have been unjaming?
must you not have been unjaming?
must they not have been unjaming?