could engineer
Verbo regular: engineer - engineered- engineered

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

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

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

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