must surface
Regular verb: surface - surfaced- surfaced

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must surface
you must surface
he must surface
we must surface
you must surface
they must surface 	I must be surfacing
you must be surfacing
he must be surfacing
we must be surfacing
you must be surfacing
they must be surfacing	I must have surfaced
you must have surfaced
he must have surfaced
we must have surfaced
you must have surfaced
they must have surfaced	I must have been surfacing
you must have been surfacing
he must have been surfacing
we must have been surfacing
you must have been surfacing
they must have been surfacing	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I mustn't surface
you mustn't surface
he mustn't surface
we mustn't surface
you mustn't surface
they mustn't surface 	I mustn't be surfacing
you mustn't be surfacing
he mustn't be surfacing
we mustn't be surfacing
you mustn't be surfacing
they mustn't be surfacing	I mustn't have surfaced
you mustn't have surfaced
he mustn't have surfaced
we mustn't have surfaced
you mustn't have surfaced
they mustn't have surfaced	I mustn't have been surfacing
you mustn't have been surfacing
he mustn't have been surfacing
we mustn't have been surfacing
you mustn't have been surfacing
they mustn't have been surfacing	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I surface?
must you surface?
must he surface?
must we surface?
must you surface?
must they surface? 	must I be surfacing?
must you be surfacing?
must he be surfacing?
must we be surfacing?
must you be surfacing?
must they be surfacing? 	must I have surfaced?
must you have surfaced?
must he have surfaced?
must we have surfaced?
must you have surfaced?
must they have surfaced? 	must I have been surfacing?
must you have been surfacing?
must he have been surfacing?
must we have been surfacing?
must you have been surfacing?
must they have been surfacing? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
mustn't I surface?
mustn't you surface?
mustn't he surface?
mustn't we surface?
mustn't you surface?
mustn't they surface? 	mustn't I be surfacing?
mustn't you be surfacing?
mustn't he be surfacing?
mustn't we be surfacing?
mustn't you be surfacing?
mustn't they be surfacing? 	mustn't I have surfaced?
mustn't you have surfaced?
mustn't he have surfaced?
mustn't we have surfaced?
mustn't you have surfaced?
mustn't they have surfaced? 	mustn't I have been surfacing?
mustn't you have been surfacing?
mustn't he have been surfacing?
mustn't we have been surfacing?
mustn't you have been surfacing?
mustn't they have been surfacing?