I can teach you can teach he can teach we can teach you can teach they can teach
Forma com V-ing
I can be teaching you can be teaching he can be teaching we can be teaching you can be teaching they can be teaching
Perfeito
I can have taught you can have taught he can have taught we can have taught you can have taught they can have taught
Perfeito com V-ing
I can have been teaching you can have been teaching he can have been teaching we can have been teaching you can have been teaching they can have been teaching
Negação
Forma simple
I cannot teach you cannot teach he cannot teach we cannot teach you cannot teach they cannot teach
Forma com V-ing
I cannot be teaching you cannot be teaching he cannot be teaching we cannot be teaching you cannot be teaching they cannot be teaching
Perfeito
I cannot have taught you cannot have taught he cannot have taught we cannot have taught you cannot have taught they cannot have taught
Perfeito com V-ing
I cannot have been teaching you cannot have been teaching he cannot have been teaching we cannot have been teaching you cannot have been teaching they cannot have been teaching
Forma interrogativa
Forma simple
can I teach? can you teach? can he teach? can we teach? can you teach? can they teach?
Forma com V-ing
can I be teaching? can you be teaching? can he be teaching? can we be teaching? can you be teaching? can they be teaching?
Perfeito
can I have taught? can you have taught? can he have taught? can we have taught? can you have taught? can they have taught?
Perfeito com V-ing
can I have been teaching? can you have been teaching? can he have been teaching? can we have been teaching? can you have been teaching? can they have been teaching?
Forma interro-Negação
Forma simple
can I not teach? can you not teach? can he not teach? can we not teach? can you not teach? can they not teach?
Forma com V-ing
can I not be teaching? can you not be teaching? can he not be teaching? can we not be teaching? can you not be teaching? can they not be teaching?
Perfeito
can I not have taught? can you not have taught? can he not have taught? can we not have taught? can you not have taught? can they not have taught?
Perfeito com V-ing
can I not have been teaching? can you not have been teaching? can he not have been teaching? can we not have been teaching? can you not have been teaching? can they not have been teaching?