must simmer
Regular verb: simmer - simmered- simmered

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must simmer
you must simmer
she must simmer
we must simmer
you must simmer
they must simmer 	I must be simmering
you must be simmering
she must be simmering
we must be simmering
you must be simmering
they must be simmering	I must have simmered
you must have simmered
she must have simmered
we must have simmered
you must have simmered
they must have simmered	I must have been simmering
you must have been simmering
she must have been simmering
we must have been simmering
you must have been simmering
they must have been simmering	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I mustn't simmer
you mustn't simmer
she mustn't simmer
we mustn't simmer
you mustn't simmer
they mustn't simmer 	I mustn't be simmering
you mustn't be simmering
she mustn't be simmering
we mustn't be simmering
you mustn't be simmering
they mustn't be simmering	I mustn't have simmered
you mustn't have simmered
she mustn't have simmered
we mustn't have simmered
you mustn't have simmered
they mustn't have simmered	I mustn't have been simmering
you mustn't have been simmering
she mustn't have been simmering
we mustn't have been simmering
you mustn't have been simmering
they mustn't have been simmering	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I simmer?
must you simmer?
must she simmer?
must we simmer?
must you simmer?
must they simmer? 	must I be simmering?
must you be simmering?
must she be simmering?
must we be simmering?
must you be simmering?
must they be simmering? 	must I have simmered?
must you have simmered?
must she have simmered?
must we have simmered?
must you have simmered?
must they have simmered? 	must I have been simmering?
must you have been simmering?
must she have been simmering?
must we have been simmering?
must you have been simmering?
must they have been simmering? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
mustn't I simmer?
mustn't you simmer?
mustn't she simmer?
mustn't we simmer?
mustn't you simmer?
mustn't they simmer? 	mustn't I be simmering?
mustn't you be simmering?
mustn't she be simmering?
mustn't we be simmering?
mustn't you be simmering?
mustn't they be simmering? 	mustn't I have simmered?
mustn't you have simmered?
mustn't she have simmered?
mustn't we have simmered?
mustn't you have simmered?
mustn't they have simmered? 	mustn't I have been simmering?
mustn't you have been simmering?
mustn't she have been simmering?
mustn't we have been simmering?
mustn't you have been simmering?
mustn't they have been simmering?