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