could teach
Irregular verb: teach - taught- taught

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could teach
you could teach
he could teach
we could teach
you could teach
they could teach 	I could be teaching
you could be teaching
he could be teaching
we could be teaching
you could be teaching
they could be teaching	I could have taught
you could have taught
he 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
he 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 	Perfect 	V-ing perfect 	
I couldn't teach
you couldn't teach
he 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
he couldn't be teaching
we couldn't be teaching
you couldn't be teaching
they couldn't be teaching	I couldn't have taught
you couldn't have taught
he 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
he 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 	Perfect 	V-ing perfect 	
could I teach?
could you teach?
could he teach?
could we teach?
could you teach?
could they teach? 	could I be teaching?
could you be teaching?
could he be teaching?
could we be teaching?
could you be teaching?
could they be teaching? 	could I have taught?
could you have taught?
could he 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 he 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 	Perfect 	V-ing perfect 	
couldn't I teach?
couldn't you teach?
couldn't he 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 he be teaching?
couldn't we be teaching?
couldn't you be teaching?
couldn't they be teaching? 	couldn't I have taught?
couldn't you have taught?
couldn't he 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 he have been teaching?
couldn't we have been teaching?
couldn't you have been teaching?
couldn't they have been teaching?