could estop
Regular verb: estop - estoped- estoped

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could estop
you could estop
she could estop
we could estop
you could estop
they could estop 	I could be estoping
you could be estoping
she could be estoping
we could be estoping
you could be estoping
they could be estoping	I could have estoped
you could have estoped
she could have estoped
we could have estoped
you could have estoped
they could have estoped	I could have been estoping
you could have been estoping
she could have been estoping
we could have been estoping
you could have been estoping
they could have been estoping	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I couldn't estop
you couldn't estop
she couldn't estop
we couldn't estop
you couldn't estop
they couldn't estop 	I couldn't be estoping
you couldn't be estoping
she couldn't be estoping
we couldn't be estoping
you couldn't be estoping
they couldn't be estoping	I couldn't have estoped
you couldn't have estoped
she couldn't have estoped
we couldn't have estoped
you couldn't have estoped
they couldn't have estoped	I couldn't have been estoping
you couldn't have been estoping
she couldn't have been estoping
we couldn't have been estoping
you couldn't have been estoping
they couldn't have been estoping	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I estop?
could you estop?
could she estop?
could we estop?
could you estop?
could they estop? 	could I be estoping?
could you be estoping?
could she be estoping?
could we be estoping?
could you be estoping?
could they be estoping? 	could I have estoped?
could you have estoped?
could she have estoped?
could we have estoped?
could you have estoped?
could they have estoped? 	could I have been estoping?
could you have been estoping?
could she have been estoping?
could we have been estoping?
could you have been estoping?
could they have been estoping? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
couldn't I estop?
couldn't you estop?
couldn't she estop?
couldn't we estop?
couldn't you estop?
couldn't they estop? 	couldn't I be estoping?
couldn't you be estoping?
couldn't she be estoping?
couldn't we be estoping?
couldn't you be estoping?
couldn't they be estoping? 	couldn't I have estoped?
couldn't you have estoped?
couldn't she have estoped?
couldn't we have estoped?
couldn't you have estoped?
couldn't they have estoped? 	couldn't I have been estoping?
couldn't you have been estoping?
couldn't she have been estoping?
couldn't we have been estoping?
couldn't you have been estoping?
couldn't they have been estoping?