must zero
Regular verb: zero - zeroed- zeroed

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must zero
you must zero
she must zero
we must zero
you must zero
they must zero 	I must be zeroing
you must be zeroing
she must be zeroing
we must be zeroing
you must be zeroing
they must be zeroing	I must have zeroed
you must have zeroed
she must have zeroed
we must have zeroed
you must have zeroed
they must have zeroed	I must have been zeroing
you must have been zeroing
she must have been zeroing
we must have been zeroing
you must have been zeroing
they must have been zeroing	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must not zero
you must not zero
she must not zero
we must not zero
you must not zero
they must not zero 	I must not be zeroing
you must not be zeroing
she must not be zeroing
we must not be zeroing
you must not be zeroing
they must not be zeroing	I must not have zeroed
you must not have zeroed
she must not have zeroed
we must not have zeroed
you must not have zeroed
they must not have zeroed	I must not have been zeroing
you must not have been zeroing
she must not have been zeroing
we must not have been zeroing
you must not have been zeroing
they must not have been zeroing	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I zero?
must you zero?
must she zero?
must we zero?
must you zero?
must they zero? 	must I be zeroing?
must you be zeroing?
must she be zeroing?
must we be zeroing?
must you be zeroing?
must they be zeroing? 	must I have zeroed?
must you have zeroed?
must she have zeroed?
must we have zeroed?
must you have zeroed?
must they have zeroed? 	must I have been zeroing?
must you have been zeroing?
must she have been zeroing?
must we have been zeroing?
must you have been zeroing?
must they have been zeroing? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I not zero?
must you not zero?
must she not zero?
must we not zero?
must you not zero?
must they not zero? 	must I not be zeroing?
must you not be zeroing?
must she not be zeroing?
must we not be zeroing?
must you not be zeroing?
must they not be zeroing? 	must I not have zeroed?
must you not have zeroed?
must she not have zeroed?
must we not have zeroed?
must you not have zeroed?
must they not have zeroed? 	must I not have been zeroing?
must you not have been zeroing?
must she not have been zeroing?
must we not have been zeroing?
must you not have been zeroing?
must they not have been zeroing?