must retire
Regular verb: retire - retired- retired

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must retire
you must retire
she must retire
we must retire
you must retire
they must retire 	I must be retiring
you must be retiring
she must be retiring
we must be retiring
you must be retiring
they must be retiring	I must have retired
you must have retired
she must have retired
we must have retired
you must have retired
they must have retired	I must have been retiring
you must have been retiring
she must have been retiring
we must have been retiring
you must have been retiring
they must have been retiring	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must not retire
you must not retire
she must not retire
we must not retire
you must not retire
they must not retire 	I must not be retiring
you must not be retiring
she must not be retiring
we must not be retiring
you must not be retiring
they must not be retiring	I must not have retired
you must not have retired
she must not have retired
we must not have retired
you must not have retired
they must not have retired	I must not have been retiring
you must not have been retiring
she must not have been retiring
we must not have been retiring
you must not have been retiring
they must not have been retiring	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I retire?
must you retire?
must she retire?
must we retire?
must you retire?
must they retire? 	must I be retiring?
must you be retiring?
must she be retiring?
must we be retiring?
must you be retiring?
must they be retiring? 	must I have retired?
must you have retired?
must she have retired?
must we have retired?
must you have retired?
must they have retired? 	must I have been retiring?
must you have been retiring?
must she have been retiring?
must we have been retiring?
must you have been retiring?
must they have been retiring? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I not retire?
must you not retire?
must she not retire?
must we not retire?
must you not retire?
must they not retire? 	must I not be retiring?
must you not be retiring?
must she not be retiring?
must we not be retiring?
must you not be retiring?
must they not be retiring? 	must I not have retired?
must you not have retired?
must she not have retired?
must we not have retired?
must you not have retired?
must they not have retired? 	must I not have been retiring?
must you not have been retiring?
must she not have been retiring?
must we not have been retiring?
must you not have been retiring?
must they not have been retiring?