English verb conjugation
COULD TEACH

Irregular verb: teach - taught - taught

Affirmation

Simple form	V-ing form
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
Perfect	V-ing perfect
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

Negation

Simple form	V-ing form
I couldn't teach you couldn't teach she couldn't teach we couldn't teach you couldn't teach they couldn't teach	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
Perfect	V-ing perfect
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	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

Interrogative form

Simple form	V-ing form
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?
Perfect	V-ing perfect
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?

Interro-negative form

Simple form	V-ing form
couldn't I teach? couldn't you teach? couldn't she teach? couldn't we teach? couldn't you teach? couldn't they teach?	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?
Perfect	V-ing perfect
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?	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?