must efface
Regular verb: efface - effaced- effaced

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must efface
you must efface
he must efface
we must efface
you must efface
they must efface 	I must be effacing
you must be effacing
he must be effacing
we must be effacing
you must be effacing
they must be effacing	I must have effaced
you must have effaced
he must have effaced
we must have effaced
you must have effaced
they must have effaced	I must have been effacing
you must have been effacing
he must have been effacing
we must have been effacing
you must have been effacing
they must have been effacing	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I mustn't efface
you mustn't efface
he mustn't efface
we mustn't efface
you mustn't efface
they mustn't efface 	I mustn't be effacing
you mustn't be effacing
he mustn't be effacing
we mustn't be effacing
you mustn't be effacing
they mustn't be effacing	I mustn't have effaced
you mustn't have effaced
he mustn't have effaced
we mustn't have effaced
you mustn't have effaced
they mustn't have effaced	I mustn't have been effacing
you mustn't have been effacing
he mustn't have been effacing
we mustn't have been effacing
you mustn't have been effacing
they mustn't have been effacing	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I efface?
must you efface?
must he efface?
must we efface?
must you efface?
must they efface? 	must I be effacing?
must you be effacing?
must he be effacing?
must we be effacing?
must you be effacing?
must they be effacing? 	must I have effaced?
must you have effaced?
must he have effaced?
must we have effaced?
must you have effaced?
must they have effaced? 	must I have been effacing?
must you have been effacing?
must he have been effacing?
must we have been effacing?
must you have been effacing?
must they have been effacing? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
mustn't I efface?
mustn't you efface?
mustn't he efface?
mustn't we efface?
mustn't you efface?
mustn't they efface? 	mustn't I be effacing?
mustn't you be effacing?
mustn't he be effacing?
mustn't we be effacing?
mustn't you be effacing?
mustn't they be effacing? 	mustn't I have effaced?
mustn't you have effaced?
mustn't he have effaced?
mustn't we have effaced?
mustn't you have effaced?
mustn't they have effaced? 	mustn't I have been effacing?
mustn't you have been effacing?
mustn't he have been effacing?
mustn't we have been effacing?
mustn't you have been effacing?
mustn't they have been effacing?