must effervesce
Regular verb: effervesce - effervesced- effervesced

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must effervesce
you must effervesce
he must effervesce
we must effervesce
you must effervesce
they must effervesce 	I must be effervescing
you must be effervescing
he must be effervescing
we must be effervescing
you must be effervescing
they must be effervescing	I must have effervesced
you must have effervesced
he must have effervesced
we must have effervesced
you must have effervesced
they must have effervesced	I must have been effervescing
you must have been effervescing
he must have been effervescing
we must have been effervescing
you must have been effervescing
they must have been effervescing	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I mustn't effervesce
you mustn't effervesce
he mustn't effervesce
we mustn't effervesce
you mustn't effervesce
they mustn't effervesce 	I mustn't be effervescing
you mustn't be effervescing
he mustn't be effervescing
we mustn't be effervescing
you mustn't be effervescing
they mustn't be effervescing	I mustn't have effervesced
you mustn't have effervesced
he mustn't have effervesced
we mustn't have effervesced
you mustn't have effervesced
they mustn't have effervesced	I mustn't have been effervescing
you mustn't have been effervescing
he mustn't have been effervescing
we mustn't have been effervescing
you mustn't have been effervescing
they mustn't have been effervescing	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I effervesce?
must you effervesce?
must he effervesce?
must we effervesce?
must you effervesce?
must they effervesce? 	must I be effervescing?
must you be effervescing?
must he be effervescing?
must we be effervescing?
must you be effervescing?
must they be effervescing? 	must I have effervesced?
must you have effervesced?
must he have effervesced?
must we have effervesced?
must you have effervesced?
must they have effervesced? 	must I have been effervescing?
must you have been effervescing?
must he have been effervescing?
must we have been effervescing?
must you have been effervescing?
must they have been effervescing? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
mustn't I effervesce?
mustn't you effervesce?
mustn't he effervesce?
mustn't we effervesce?
mustn't you effervesce?
mustn't they effervesce? 	mustn't I be effervescing?
mustn't you be effervescing?
mustn't he be effervescing?
mustn't we be effervescing?
mustn't you be effervescing?
mustn't they be effervescing? 	mustn't I have effervesced?
mustn't you have effervesced?
mustn't he have effervesced?
mustn't we have effervesced?
mustn't you have effervesced?
mustn't they have effervesced? 	mustn't I have been effervescing?
mustn't you have been effervescing?
mustn't he have been effervescing?
mustn't we have been effervescing?
mustn't you have been effervescing?
mustn't they have been effervescing?