could overwater
Regular verb: overwater - overwatered- overwatered

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could overwater
you could overwater
he could overwater
we could overwater
you could overwater
they could overwater 	I could be overwatering
you could be overwatering
he could be overwatering
we could be overwatering
you could be overwatering
they could be overwatering	I could have overwatered
you could have overwatered
he could have overwatered
we could have overwatered
you could have overwatered
they could have overwatered	I could have been overwatering
you could have been overwatering
he could have been overwatering
we could have been overwatering
you could have been overwatering
they could have been overwatering	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I couldn't overwater
you couldn't overwater
he couldn't overwater
we couldn't overwater
you couldn't overwater
they couldn't overwater 	I couldn't be overwatering
you couldn't be overwatering
he couldn't be overwatering
we couldn't be overwatering
you couldn't be overwatering
they couldn't be overwatering	I couldn't have overwatered
you couldn't have overwatered
he couldn't have overwatered
we couldn't have overwatered
you couldn't have overwatered
they couldn't have overwatered	I couldn't have been overwatering
you couldn't have been overwatering
he couldn't have been overwatering
we couldn't have been overwatering
you couldn't have been overwatering
they couldn't have been overwatering	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I overwater?
could you overwater?
could he overwater?
could we overwater?
could you overwater?
could they overwater? 	could I be overwatering?
could you be overwatering?
could he be overwatering?
could we be overwatering?
could you be overwatering?
could they be overwatering? 	could I have overwatered?
could you have overwatered?
could he have overwatered?
could we have overwatered?
could you have overwatered?
could they have overwatered? 	could I have been overwatering?
could you have been overwatering?
could he have been overwatering?
could we have been overwatering?
could you have been overwatering?
could they have been overwatering? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
couldn't I overwater?
couldn't you overwater?
couldn't he overwater?
couldn't we overwater?
couldn't you overwater?
couldn't they overwater? 	couldn't I be overwatering?
couldn't you be overwatering?
couldn't he be overwatering?
couldn't we be overwatering?
couldn't you be overwatering?
couldn't they be overwatering? 	couldn't I have overwatered?
couldn't you have overwatered?
couldn't he have overwatered?
couldn't we have overwatered?
couldn't you have overwatered?
couldn't they have overwatered? 	couldn't I have been overwatering?
couldn't you have been overwatering?
couldn't he have been overwatering?
couldn't we have been overwatering?
couldn't you have been overwatering?
couldn't they have been overwatering?