must zing
Regular verb: zing - zinged- zinged

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must zing
you must zing
she must zing
we must zing
you must zing
they must zing 	I must be zinging
you must be zinging
she must be zinging
we must be zinging
you must be zinging
they must be zinging	I must have zinged
you must have zinged
she must have zinged
we must have zinged
you must have zinged
they must have zinged	I must have been zinging
you must have been zinging
she must have been zinging
we must have been zinging
you must have been zinging
they must have been zinging	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must not zing
you must not zing
she must not zing
we must not zing
you must not zing
they must not zing 	I must not be zinging
you must not be zinging
she must not be zinging
we must not be zinging
you must not be zinging
they must not be zinging	I must not have zinged
you must not have zinged
she must not have zinged
we must not have zinged
you must not have zinged
they must not have zinged	I must not have been zinging
you must not have been zinging
she must not have been zinging
we must not have been zinging
you must not have been zinging
they must not have been zinging	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I zing?
must you zing?
must she zing?
must we zing?
must you zing?
must they zing? 	must I be zinging?
must you be zinging?
must she be zinging?
must we be zinging?
must you be zinging?
must they be zinging? 	must I have zinged?
must you have zinged?
must she have zinged?
must we have zinged?
must you have zinged?
must they have zinged? 	must I have been zinging?
must you have been zinging?
must she have been zinging?
must we have been zinging?
must you have been zinging?
must they have been zinging? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I not zing?
must you not zing?
must she not zing?
must we not zing?
must you not zing?
must they not zing? 	must I not be zinging?
must you not be zinging?
must she not be zinging?
must we not be zinging?
must you not be zinging?
must they not be zinging? 	must I not have zinged?
must you not have zinged?
must she not have zinged?
must we not have zinged?
must you not have zinged?
must they not have zinged? 	must I not have been zinging?
must you not have been zinging?
must she not have been zinging?
must we not have been zinging?
must you not have been zinging?
must they not have been zinging?