must smother
Regular verb: smother - smothered- smothered

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must smother
you must smother
he must smother
we must smother
you must smother
they must smother 	I must be smothering
you must be smothering
he must be smothering
we must be smothering
you must be smothering
they must be smothering	I must have smothered
you must have smothered
he must have smothered
we must have smothered
you must have smothered
they must have smothered	I must have been smothering
you must have been smothering
he must have been smothering
we must have been smothering
you must have been smothering
they must have been smothering	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must not smother
you must not smother
he must not smother
we must not smother
you must not smother
they must not smother 	I must not be smothering
you must not be smothering
he must not be smothering
we must not be smothering
you must not be smothering
they must not be smothering	I must not have smothered
you must not have smothered
he must not have smothered
we must not have smothered
you must not have smothered
they must not have smothered	I must not have been smothering
you must not have been smothering
he must not have been smothering
we must not have been smothering
you must not have been smothering
they must not have been smothering	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I smother?
must you smother?
must he smother?
must we smother?
must you smother?
must they smother? 	must I be smothering?
must you be smothering?
must he be smothering?
must we be smothering?
must you be smothering?
must they be smothering? 	must I have smothered?
must you have smothered?
must he have smothered?
must we have smothered?
must you have smothered?
must they have smothered? 	must I have been smothering?
must you have been smothering?
must he have been smothering?
must we have been smothering?
must you have been smothering?
must they have been smothering? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I not smother?
must you not smother?
must he not smother?
must we not smother?
must you not smother?
must they not smother? 	must I not be smothering?
must you not be smothering?
must he not be smothering?
must we not be smothering?
must you not be smothering?
must they not be smothering? 	must I not have smothered?
must you not have smothered?
must he not have smothered?
must we not have smothered?
must you not have smothered?
must they not have smothered? 	must I not have been smothering?
must you not have been smothering?
must he not have been smothering?
must we not have been smothering?
must you not have been smothering?
must they not have been smothering?