I could teach you could teach she could teach we could teach you could teach they could teach
Forma com V-ing
I could be teaching you could be teaching she could be teaching we could be teaching you could be teaching they could be teaching
Perfeito
I could have taught you could have taught she could have taught we could have taught you could have taught they could have taught
Perfeito com V-ing
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
I couldn't teach you couldn't teach she couldn't teach we couldn't teach you couldn't teach they couldn't teach
Forma com V-ing
I couldn't be teaching you couldn't be teaching she couldn't be teaching we couldn't be teaching you couldn't be teaching they couldn't be teaching
Perfeito
I couldn't have taught you couldn't have taught she couldn't have taught we couldn't have taught you couldn't have taught they couldn't have taught
Perfeito com V-ing
I couldn't have been teaching you couldn't have been teaching she couldn't have been teaching we couldn't have been teaching you couldn't have been teaching they couldn't have been teaching
Forma interrogativa
Forma simple
could I teach? could you teach? could she teach? could we teach? could you teach? could they teach?
Forma com V-ing
could I be teaching? could you be teaching? could she be teaching? could we be teaching? could you be teaching? could they be teaching?
Perfeito
could I have taught? could you have taught? could she have taught? could we have taught? could you have taught? could they have taught?
Perfeito com V-ing
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
couldn't I teach? couldn't you teach? couldn't she teach? couldn't we teach? couldn't you teach? couldn't they teach?
Forma com V-ing
couldn't I be teaching? couldn't you be teaching? couldn't she be teaching? couldn't we be teaching? couldn't you be teaching? couldn't they be teaching?
Perfeito
couldn't I have taught? couldn't you have taught? couldn't she have taught? couldn't we have taught? couldn't you have taught? couldn't they have taught?
Perfeito com V-ing
couldn't I have been teaching? couldn't you have been teaching? couldn't she have been teaching? couldn't we have been teaching? couldn't you have been teaching? couldn't they have been teaching?