must stopper
Regular verb: stopper - stoppered- stoppered

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must stopper
you must stopper
he must stopper
we must stopper
you must stopper
they must stopper 	I must be stoppering
you must be stoppering
he must be stoppering
we must be stoppering
you must be stoppering
they must be stoppering	I must have stoppered
you must have stoppered
he must have stoppered
we must have stoppered
you must have stoppered
they must have stoppered	I must have been stoppering
you must have been stoppering
he must have been stoppering
we must have been stoppering
you must have been stoppering
they must have been stoppering	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must not stopper
you must not stopper
he must not stopper
we must not stopper
you must not stopper
they must not stopper 	I must not be stoppering
you must not be stoppering
he must not be stoppering
we must not be stoppering
you must not be stoppering
they must not be stoppering	I must not have stoppered
you must not have stoppered
he must not have stoppered
we must not have stoppered
you must not have stoppered
they must not have stoppered	I must not have been stoppering
you must not have been stoppering
he must not have been stoppering
we must not have been stoppering
you must not have been stoppering
they must not have been stoppering	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I stopper?
must you stopper?
must he stopper?
must we stopper?
must you stopper?
must they stopper? 	must I be stoppering?
must you be stoppering?
must he be stoppering?
must we be stoppering?
must you be stoppering?
must they be stoppering? 	must I have stoppered?
must you have stoppered?
must he have stoppered?
must we have stoppered?
must you have stoppered?
must they have stoppered? 	must I have been stoppering?
must you have been stoppering?
must he have been stoppering?
must we have been stoppering?
must you have been stoppering?
must they have been stoppering? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I not stopper?
must you not stopper?
must he not stopper?
must we not stopper?
must you not stopper?
must they not stopper? 	must I not be stoppering?
must you not be stoppering?
must he not be stoppering?
must we not be stoppering?
must you not be stoppering?
must they not be stoppering? 	must I not have stoppered?
must you not have stoppered?
must he not have stoppered?
must we not have stoppered?
must you not have stoppered?
must they not have stoppered? 	must I not have been stoppering?
must you not have been stoppering?
must he not have been stoppering?
must we not have been stoppering?
must you not have been stoppering?
must they not have been stoppering?