must engineer
Verbo regular: engineer - engineered- engineered

Afirmación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I must engineer
you must engineer
he must engineer
we must engineer
you must engineer
they must engineer 	I must be engineering
you must be engineering
he must be engineering
we must be engineering
you must be engineering
they must be engineering	I must have engineered
you must have engineered
he must have engineered
we must have engineered
you must have engineered
they must have engineered	I must have been engineering
you must have been engineering
he must have been engineering
we must have been engineering
you must have been engineering
they must have been engineering	

Negación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I must not engineer
you must not engineer
he must not engineer
we must not engineer
you must not engineer
they must not engineer 	I must not be engineering
you must not be engineering
he must not be engineering
we must not be engineering
you must not be engineering
they must not be engineering	I must not have engineered
you must not have engineered
he must not have engineered
we must not have engineered
you must not have engineered
they must not have engineered	I must not have been engineering
you must not have been engineering
he must not have been engineering
we must not have been engineering
you must not have been engineering
they must not have been engineering	

Forma interrogativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
must I engineer?
must you engineer?
must he engineer?
must we engineer?
must you engineer?
must they engineer? 	must I be engineering?
must you be engineering?
must he be engineering?
must we be engineering?
must you be engineering?
must they be engineering? 	must I have engineered?
must you have engineered?
must he have engineered?
must we have engineered?
must you have engineered?
must they have engineered? 	must I have been engineering?
must you have been engineering?
must he have been engineering?
must we have been engineering?
must you have been engineering?
must they have been engineering? 	

Forma interro-negativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
must I not engineer?
must you not engineer?
must he not engineer?
must we not engineer?
must you not engineer?
must they not engineer? 	must I not be engineering?
must you not be engineering?
must he not be engineering?
must we not be engineering?
must you not be engineering?
must they not be engineering? 	must I not have engineered?
must you not have engineered?
must he not have engineered?
must we not have engineered?
must you not have engineered?
must they not have engineered? 	must I not have been engineering?
must you not have been engineering?
must he not have been engineering?
must we not have been engineering?
must you not have been engineering?
must they not have been engineering?