must smother
Regular verb: smother - smothered- smothered

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