must specialize
Verbo regular: specialize - specialized- specialized

Afirmação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I must specialize
you must specialize
he must specialize
we must specialize
you must specialize
they must specialize 	I must be specializing
you must be specializing
he must be specializing
we must be specializing
you must be specializing
they must be specializing	I must have specialized
you must have specialized
he must have specialized
we must have specialized
you must have specialized
they must have specialized	I must have been specializing
you must have been specializing
he must have been specializing
we must have been specializing
you must have been specializing
they must have been specializing	

Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I must not specialize
you must not specialize
he must not specialize
we must not specialize
you must not specialize
they must not specialize 	I must not be specializing
you must not be specializing
he must not be specializing
we must not be specializing
you must not be specializing
they must not be specializing	I must not have specialized
you must not have specialized
he must not have specialized
we must not have specialized
you must not have specialized
they must not have specialized	I must not have been specializing
you must not have been specializing
he must not have been specializing
we must not have been specializing
you must not have been specializing
they must not have been specializing	

Forma interrogativa 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
must I specialize?
must you specialize?
must he specialize?
must we specialize?
must you specialize?
must they specialize? 	must I be specializing?
must you be specializing?
must he be specializing?
must we be specializing?
must you be specializing?
must they be specializing? 	must I have specialized?
must you have specialized?
must he have specialized?
must we have specialized?
must you have specialized?
must they have specialized? 	must I have been specializing?
must you have been specializing?
must he have been specializing?
must we have been specializing?
must you have been specializing?
must they have been specializing? 	

Forma interro-Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
must I not specialize?
must you not specialize?
must he not specialize?
must we not specialize?
must you not specialize?
must they not specialize? 	must I not be specializing?
must you not be specializing?
must he not be specializing?
must we not be specializing?
must you not be specializing?
must they not be specializing? 	must I not have specialized?
must you not have specialized?
must he not have specialized?
must we not have specialized?
must you not have specialized?
must they not have specialized? 	must I not have been specializing?
must you not have been specializing?
must he not have been specializing?
must we not have been specializing?
must you not have been specializing?
must they not have been specializing?