must subspecialize
Regular verb: subspecialize - subspecialized- subspecialized

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must subspecialize
you must subspecialize
she must subspecialize
we must subspecialize
you must subspecialize
they must subspecialize 	I must be subspecializing
you must be subspecializing
she must be subspecializing
we must be subspecializing
you must be subspecializing
they must be subspecializing	I must have subspecialized
you must have subspecialized
she must have subspecialized
we must have subspecialized
you must have subspecialized
they must have subspecialized	I must have been subspecializing
you must have been subspecializing
she must have been subspecializing
we must have been subspecializing
you must have been subspecializing
they must have been subspecializing	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must not subspecialize
you must not subspecialize
she must not subspecialize
we must not subspecialize
you must not subspecialize
they must not subspecialize 	I must not be subspecializing
you must not be subspecializing
she must not be subspecializing
we must not be subspecializing
you must not be subspecializing
they must not be subspecializing	I must not have subspecialized
you must not have subspecialized
she must not have subspecialized
we must not have subspecialized
you must not have subspecialized
they must not have subspecialized	I must not have been subspecializing
you must not have been subspecializing
she must not have been subspecializing
we must not have been subspecializing
you must not have been subspecializing
they must not have been subspecializing	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I subspecialize?
must you subspecialize?
must she subspecialize?
must we subspecialize?
must you subspecialize?
must they subspecialize? 	must I be subspecializing?
must you be subspecializing?
must she be subspecializing?
must we be subspecializing?
must you be subspecializing?
must they be subspecializing? 	must I have subspecialized?
must you have subspecialized?
must she have subspecialized?
must we have subspecialized?
must you have subspecialized?
must they have subspecialized? 	must I have been subspecializing?
must you have been subspecializing?
must she have been subspecializing?
must we have been subspecializing?
must you have been subspecializing?
must they have been subspecializing? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I not subspecialize?
must you not subspecialize?
must she not subspecialize?
must we not subspecialize?
must you not subspecialize?
must they not subspecialize? 	must I not be subspecializing?
must you not be subspecializing?
must she not be subspecializing?
must we not be subspecializing?
must you not be subspecializing?
must they not be subspecializing? 	must I not have subspecialized?
must you not have subspecialized?
must she not have subspecialized?
must we not have subspecialized?
must you not have subspecialized?
must they not have subspecialized? 	must I not have been subspecializing?
must you not have been subspecializing?
must she not have been subspecializing?
must we not have been subspecializing?
must you not have been subspecializing?
must they not have been subspecializing?