must zip
Regular verb: zip - zipped- zipped

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must zip
you must zip
he must zip
we must zip
you must zip
they must zip 	I must be zipping
you must be zipping
he must be zipping
we must be zipping
you must be zipping
they must be zipping	I must have zipped
you must have zipped
he must have zipped
we must have zipped
you must have zipped
they must have zipped	I must have been zipping
you must have been zipping
he must have been zipping
we must have been zipping
you must have been zipping
they must have been zipping	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must not zip
you must not zip
he must not zip
we must not zip
you must not zip
they must not zip 	I must not be zipping
you must not be zipping
he must not be zipping
we must not be zipping
you must not be zipping
they must not be zipping	I must not have zipped
you must not have zipped
he must not have zipped
we must not have zipped
you must not have zipped
they must not have zipped	I must not have been zipping
you must not have been zipping
he must not have been zipping
we must not have been zipping
you must not have been zipping
they must not have been zipping	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I zip?
must you zip?
must he zip?
must we zip?
must you zip?
must they zip? 	must I be zipping?
must you be zipping?
must he be zipping?
must we be zipping?
must you be zipping?
must they be zipping? 	must I have zipped?
must you have zipped?
must he have zipped?
must we have zipped?
must you have zipped?
must they have zipped? 	must I have been zipping?
must you have been zipping?
must he have been zipping?
must we have been zipping?
must you have been zipping?
must they have been zipping? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I not zip?
must you not zip?
must he not zip?
must we not zip?
must you not zip?
must they not zip? 	must I not be zipping?
must you not be zipping?
must he not be zipping?
must we not be zipping?
must you not be zipping?
must they not be zipping? 	must I not have zipped?
must you not have zipped?
must he not have zipped?
must we not have zipped?
must you not have zipped?
must they not have zipped? 	must I not have been zipping?
must you not have been zipping?
must he not have been zipping?
must we not have been zipping?
must you not have been zipping?
must they not have been zipping?