could overlearn
Regular verb: overlearn - overlearned- overlearned

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could overlearn
you could overlearn
he could overlearn
we could overlearn
you could overlearn
they could overlearn 	I could be overlearning
you could be overlearning
he could be overlearning
we could be overlearning
you could be overlearning
they could be overlearning	I could have overlearned
you could have overlearned
he could have overlearned
we could have overlearned
you could have overlearned
they could have overlearned	I could have been overlearning
you could have been overlearning
he could have been overlearning
we could have been overlearning
you could have been overlearning
they could have been overlearning	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I couldn't overlearn
you couldn't overlearn
he couldn't overlearn
we couldn't overlearn
you couldn't overlearn
they couldn't overlearn 	I couldn't be overlearning
you couldn't be overlearning
he couldn't be overlearning
we couldn't be overlearning
you couldn't be overlearning
they couldn't be overlearning	I couldn't have overlearned
you couldn't have overlearned
he couldn't have overlearned
we couldn't have overlearned
you couldn't have overlearned
they couldn't have overlearned	I couldn't have been overlearning
you couldn't have been overlearning
he couldn't have been overlearning
we couldn't have been overlearning
you couldn't have been overlearning
they couldn't have been overlearning	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I overlearn?
could you overlearn?
could he overlearn?
could we overlearn?
could you overlearn?
could they overlearn? 	could I be overlearning?
could you be overlearning?
could he be overlearning?
could we be overlearning?
could you be overlearning?
could they be overlearning? 	could I have overlearned?
could you have overlearned?
could he have overlearned?
could we have overlearned?
could you have overlearned?
could they have overlearned? 	could I have been overlearning?
could you have been overlearning?
could he have been overlearning?
could we have been overlearning?
could you have been overlearning?
could they have been overlearning? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
couldn't I overlearn?
couldn't you overlearn?
couldn't he overlearn?
couldn't we overlearn?
couldn't you overlearn?
couldn't they overlearn? 	couldn't I be overlearning?
couldn't you be overlearning?
couldn't he be overlearning?
couldn't we be overlearning?
couldn't you be overlearning?
couldn't they be overlearning? 	couldn't I have overlearned?
couldn't you have overlearned?
couldn't he have overlearned?
couldn't we have overlearned?
couldn't you have overlearned?
couldn't they have overlearned? 	couldn't I have been overlearning?
couldn't you have been overlearning?
couldn't he have been overlearning?
couldn't we have been overlearning?
couldn't you have been overlearning?
couldn't they have been overlearning?