could mingle
Regular verb: mingle - mingled- mingled

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could mingle
you could mingle
she could mingle
we could mingle
you could mingle
they could mingle 	I could be mingling
you could be mingling
she could be mingling
we could be mingling
you could be mingling
they could be mingling	I could have mingled
you could have mingled
she could have mingled
we could have mingled
you could have mingled
they could have mingled	I could have been mingling
you could have been mingling
she could have been mingling
we could have been mingling
you could have been mingling
they could have been mingling	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I couldn't mingle
you couldn't mingle
she couldn't mingle
we couldn't mingle
you couldn't mingle
they couldn't mingle 	I couldn't be mingling
you couldn't be mingling
she couldn't be mingling
we couldn't be mingling
you couldn't be mingling
they couldn't be mingling	I couldn't have mingled
you couldn't have mingled
she couldn't have mingled
we couldn't have mingled
you couldn't have mingled
they couldn't have mingled	I couldn't have been mingling
you couldn't have been mingling
she couldn't have been mingling
we couldn't have been mingling
you couldn't have been mingling
they couldn't have been mingling	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I mingle?
could you mingle?
could she mingle?
could we mingle?
could you mingle?
could they mingle? 	could I be mingling?
could you be mingling?
could she be mingling?
could we be mingling?
could you be mingling?
could they be mingling? 	could I have mingled?
could you have mingled?
could she have mingled?
could we have mingled?
could you have mingled?
could they have mingled? 	could I have been mingling?
could you have been mingling?
could she have been mingling?
could we have been mingling?
could you have been mingling?
could they have been mingling? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
couldn't I mingle?
couldn't you mingle?
couldn't she mingle?
couldn't we mingle?
couldn't you mingle?
couldn't they mingle? 	couldn't I be mingling?
couldn't you be mingling?
couldn't she be mingling?
couldn't we be mingling?
couldn't you be mingling?
couldn't they be mingling? 	couldn't I have mingled?
couldn't you have mingled?
couldn't she have mingled?
couldn't we have mingled?
couldn't you have mingled?
couldn't they have mingled? 	couldn't I have been mingling?
couldn't you have been mingling?
couldn't she have been mingling?
couldn't we have been mingling?
couldn't you have been mingling?
couldn't they have been mingling?