must estop
Regular verb: estop - estoped- estoped

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

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must not estop
you must not estop
he must not estop
we must not estop
you must not estop
they must not estop 	I must not be estoping
you must not be estoping
he must not be estoping
we must not be estoping
you must not be estoping
they must not be estoping	I must not have estoped
you must not have estoped
he must not have estoped
we must not have estoped
you must not have estoped
they must not have estoped	I must not have been estoping
you must not have been estoping
he must not have been estoping
we must not have been estoping
you must not have been estoping
they must not have been estoping	

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

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I not estop?
must you not estop?
must he not estop?
must we not estop?
must you not estop?
must they not estop? 	must I not be estoping?
must you not be estoping?
must he not be estoping?
must we not be estoping?
must you not be estoping?
must they not be estoping? 	must I not have estoped?
must you not have estoped?
must he not have estoped?
must we not have estoped?
must you not have estoped?
must they not have estoped? 	must I not have been estoping?
must you not have been estoping?
must he not have been estoping?
must we not have been estoping?
must you not have been estoping?
must they not have been estoping?