could teach
Verbo irregular: teach - taught- taught

Afirmação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I could teach
you could teach
she could teach
we could teach
you could teach
they could teach 	I could be teaching
you could be teaching
she could be teaching
we could be teaching
you could be teaching
they could be teaching	I could have taught
you could have taught
she could have taught
we could have taught
you could have taught
they could have taught	I could have been teaching
you could have been teaching
she could have been teaching
we could have been teaching
you could have been teaching
they could have been teaching	

Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I could not teach
you could not teach
she could not teach
we could not teach
you could not teach
they could not teach 	I could not be teaching
you could not be teaching
she could not be teaching
we could not be teaching
you could not be teaching
they could not be teaching	I could not have taught
you could not have taught
she could not have taught
we could not have taught
you could not have taught
they could not have taught	I could not have been teaching
you could not have been teaching
she could not have been teaching
we could not have been teaching
you could not have been teaching
they could not have been teaching	

Forma interrogativa 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
could I teach?
could you teach?
could she teach?
could we teach?
could you teach?
could they teach? 	could I be teaching?
could you be teaching?
could she be teaching?
could we be teaching?
could you be teaching?
could they be teaching? 	could I have taught?
could you have taught?
could she have taught?
could we have taught?
could you have taught?
could they have taught? 	could I have been teaching?
could you have been teaching?
could she have been teaching?
could we have been teaching?
could you have been teaching?
could they have been teaching? 	

Forma interro-Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
could I not teach?
could you not teach?
could she not teach?
could we not teach?
could you not teach?
could they not teach? 	could I not be teaching?
could you not be teaching?
could she not be teaching?
could we not be teaching?
could you not be teaching?
could they not be teaching? 	could I not have taught?
could you not have taught?
could she not have taught?
could we not have taught?
could you not have taught?
could they not have taught? 	could I not have been teaching?
could you not have been teaching?
could she not have been teaching?
could we not have been teaching?
could you not have been teaching?
could they not have been teaching?