could copulate
Regular verb: copulate - copulated- copulated

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could copulate
you could copulate
she could copulate
we could copulate
you could copulate
they could copulate 	I could be copulating
you could be copulating
she could be copulating
we could be copulating
you could be copulating
they could be copulating	I could have copulated
you could have copulated
she could have copulated
we could have copulated
you could have copulated
they could have copulated	I could have been copulating
you could have been copulating
she could have been copulating
we could have been copulating
you could have been copulating
they could have been copulating	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I couldn't copulate
you couldn't copulate
she couldn't copulate
we couldn't copulate
you couldn't copulate
they couldn't copulate 	I couldn't be copulating
you couldn't be copulating
she couldn't be copulating
we couldn't be copulating
you couldn't be copulating
they couldn't be copulating	I couldn't have copulated
you couldn't have copulated
she couldn't have copulated
we couldn't have copulated
you couldn't have copulated
they couldn't have copulated	I couldn't have been copulating
you couldn't have been copulating
she couldn't have been copulating
we couldn't have been copulating
you couldn't have been copulating
they couldn't have been copulating	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I copulate?
could you copulate?
could she copulate?
could we copulate?
could you copulate?
could they copulate? 	could I be copulating?
could you be copulating?
could she be copulating?
could we be copulating?
could you be copulating?
could they be copulating? 	could I have copulated?
could you have copulated?
could she have copulated?
could we have copulated?
could you have copulated?
could they have copulated? 	could I have been copulating?
could you have been copulating?
could she have been copulating?
could we have been copulating?
could you have been copulating?
could they have been copulating? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
couldn't I copulate?
couldn't you copulate?
couldn't she copulate?
couldn't we copulate?
couldn't you copulate?
couldn't they copulate? 	couldn't I be copulating?
couldn't you be copulating?
couldn't she be copulating?
couldn't we be copulating?
couldn't you be copulating?
couldn't they be copulating? 	couldn't I have copulated?
couldn't you have copulated?
couldn't she have copulated?
couldn't we have copulated?
couldn't you have copulated?
couldn't they have copulated? 	couldn't I have been copulating?
couldn't you have been copulating?
couldn't she have been copulating?
couldn't we have been copulating?
couldn't you have been copulating?
couldn't they have been copulating?