must pack
Regular verb: pack - packed- packed

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must pack
you must pack
she must pack
we must pack
you must pack
they must pack 	I must be packing
you must be packing
she must be packing
we must be packing
you must be packing
they must be packing	I must have packed
you must have packed
she must have packed
we must have packed
you must have packed
they must have packed	I must have been packing
you must have been packing
she must have been packing
we must have been packing
you must have been packing
they must have been packing	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must not pack
you must not pack
she must not pack
we must not pack
you must not pack
they must not pack 	I must not be packing
you must not be packing
she must not be packing
we must not be packing
you must not be packing
they must not be packing	I must not have packed
you must not have packed
she must not have packed
we must not have packed
you must not have packed
they must not have packed	I must not have been packing
you must not have been packing
she must not have been packing
we must not have been packing
you must not have been packing
they must not have been packing	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I pack?
must you pack?
must she pack?
must we pack?
must you pack?
must they pack? 	must I be packing?
must you be packing?
must she be packing?
must we be packing?
must you be packing?
must they be packing? 	must I have packed?
must you have packed?
must she have packed?
must we have packed?
must you have packed?
must they have packed? 	must I have been packing?
must you have been packing?
must she have been packing?
must we have been packing?
must you have been packing?
must they have been packing? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I not pack?
must you not pack?
must she not pack?
must we not pack?
must you not pack?
must they not pack? 	must I not be packing?
must you not be packing?
must she not be packing?
must we not be packing?
must you not be packing?
must they not be packing? 	must I not have packed?
must you not have packed?
must she not have packed?
must we not have packed?
must you not have packed?
must they not have packed? 	must I not have been packing?
must you not have been packing?
must she not have been packing?
must we not have been packing?
must you not have been packing?
must they not have been packing?