could preregulate
Regular verb: preregulate - preregulated- preregulated

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could preregulate
you could preregulate
she could preregulate
we could preregulate
you could preregulate
they could preregulate 	I could be preregulating
you could be preregulating
she could be preregulating
we could be preregulating
you could be preregulating
they could be preregulating	I could have preregulated
you could have preregulated
she could have preregulated
we could have preregulated
you could have preregulated
they could have preregulated	I could have been preregulating
you could have been preregulating
she could have been preregulating
we could have been preregulating
you could have been preregulating
they could have been preregulating	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I couldn't preregulate
you couldn't preregulate
she couldn't preregulate
we couldn't preregulate
you couldn't preregulate
they couldn't preregulate 	I couldn't be preregulating
you couldn't be preregulating
she couldn't be preregulating
we couldn't be preregulating
you couldn't be preregulating
they couldn't be preregulating	I couldn't have preregulated
you couldn't have preregulated
she couldn't have preregulated
we couldn't have preregulated
you couldn't have preregulated
they couldn't have preregulated	I couldn't have been preregulating
you couldn't have been preregulating
she couldn't have been preregulating
we couldn't have been preregulating
you couldn't have been preregulating
they couldn't have been preregulating	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I preregulate?
could you preregulate?
could she preregulate?
could we preregulate?
could you preregulate?
could they preregulate? 	could I be preregulating?
could you be preregulating?
could she be preregulating?
could we be preregulating?
could you be preregulating?
could they be preregulating? 	could I have preregulated?
could you have preregulated?
could she have preregulated?
could we have preregulated?
could you have preregulated?
could they have preregulated? 	could I have been preregulating?
could you have been preregulating?
could she have been preregulating?
could we have been preregulating?
could you have been preregulating?
could they have been preregulating? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
couldn't I preregulate?
couldn't you preregulate?
couldn't she preregulate?
couldn't we preregulate?
couldn't you preregulate?
couldn't they preregulate? 	couldn't I be preregulating?
couldn't you be preregulating?
couldn't she be preregulating?
couldn't we be preregulating?
couldn't you be preregulating?
couldn't they be preregulating? 	couldn't I have preregulated?
couldn't you have preregulated?
couldn't she have preregulated?
couldn't we have preregulated?
couldn't you have preregulated?
couldn't they have preregulated? 	couldn't I have been preregulating?
couldn't you have been preregulating?
couldn't she have been preregulating?
couldn't we have been preregulating?
couldn't you have been preregulating?
couldn't they have been preregulating?