must smell
Irregular verb: smell - smelled, smelt- smelled, smelt

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must smell
you must smell
he must smell
we must smell
you must smell
they must smell 	I must be smelling
you must be smelling
he must be smelling
we must be smelling
you must be smelling
they must be smelling	I must have smelled, smelt
you must have smelled, smelt
he must have smelled, smelt
we must have smelled, smelt
you must have smelled, smelt
they must have smelled, smelt	I must have been smelling
you must have been smelling
he must have been smelling
we must have been smelling
you must have been smelling
they must have been smelling	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I mustn't smell
you mustn't smell
he mustn't smell
we mustn't smell
you mustn't smell
they mustn't smell 	I mustn't be smelling
you mustn't be smelling
he mustn't be smelling
we mustn't be smelling
you mustn't be smelling
they mustn't be smelling	I mustn't have smelled, smelt
you mustn't have smelled, smelt
he mustn't have smelled, smelt
we mustn't have smelled, smelt
you mustn't have smelled, smelt
they mustn't have smelled, smelt	I mustn't have been smelling
you mustn't have been smelling
he mustn't have been smelling
we mustn't have been smelling
you mustn't have been smelling
they mustn't have been smelling	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I smell?
must you smell?
must he smell?
must we smell?
must you smell?
must they smell? 	must I be smelling?
must you be smelling?
must he be smelling?
must we be smelling?
must you be smelling?
must they be smelling? 	must I have smelled, smelt?
must you have smelled, smelt?
must he have smelled, smelt?
must we have smelled, smelt?
must you have smelled, smelt?
must they have smelled, smelt? 	must I have been smelling?
must you have been smelling?
must he have been smelling?
must we have been smelling?
must you have been smelling?
must they have been smelling? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
mustn't I smell?
mustn't you smell?
mustn't he smell?
mustn't we smell?
mustn't you smell?
mustn't they smell? 	mustn't I be smelling?
mustn't you be smelling?
mustn't he be smelling?
mustn't we be smelling?
mustn't you be smelling?
mustn't they be smelling? 	mustn't I have smelled, smelt?
mustn't you have smelled, smelt?
mustn't he have smelled, smelt?
mustn't we have smelled, smelt?
mustn't you have smelled, smelt?
mustn't they have smelled, smelt? 	mustn't I have been smelling?
mustn't you have been smelling?
mustn't he have been smelling?
mustn't we have been smelling?
mustn't you have been smelling?
mustn't they have been smelling?