I must surface you must surface she must surface we must surface you must surface they must surface
Forma con V-ing
I must be surfacing you must be surfacing she must be surfacing we must be surfacing you must be surfacing they must be surfacing
Perfecto
I must have surfaced you must have surfaced she must have surfaced we must have surfaced you must have surfaced they must have surfaced
Perfecto con V-ing
I must have been surfacing you must have been surfacing she must have been surfacing we must have been surfacing you must have been surfacing they must have been surfacing
Negación
Forma simple
I mustn't surface you mustn't surface she mustn't surface we mustn't surface you mustn't surface they mustn't surface
Forma con V-ing
I mustn't be surfacing you mustn't be surfacing she mustn't be surfacing we mustn't be surfacing you mustn't be surfacing they mustn't be surfacing
Perfecto
I mustn't have surfaced you mustn't have surfaced she mustn't have surfaced we mustn't have surfaced you mustn't have surfaced they mustn't have surfaced
Perfecto con V-ing
I mustn't have been surfacing you mustn't have been surfacing she mustn't have been surfacing we mustn't have been surfacing you mustn't have been surfacing they mustn't have been surfacing
Forma interrogativa
Forma simple
must I surface? must you surface? must she surface? must we surface? must you surface? must they surface?
Forma con V-ing
must I be surfacing? must you be surfacing? must she be surfacing? must we be surfacing? must you be surfacing? must they be surfacing?
Perfecto
must I have surfaced? must you have surfaced? must she have surfaced? must we have surfaced? must you have surfaced? must they have surfaced?
Perfecto con V-ing
must I have been surfacing? must you have been surfacing? must she have been surfacing? must we have been surfacing? must you have been surfacing? must they have been surfacing?
Forma interro-negativa
Forma simple
mustn't I surface? mustn't you surface? mustn't she surface? mustn't we surface? mustn't you surface? mustn't they surface?
Forma con V-ing
mustn't I be surfacing? mustn't you be surfacing? mustn't she be surfacing? mustn't we be surfacing? mustn't you be surfacing? mustn't they be surfacing?
Perfecto
mustn't I have surfaced? mustn't you have surfaced? mustn't she have surfaced? mustn't we have surfaced? mustn't you have surfaced? mustn't they have surfaced?
Perfecto con V-ing
mustn't I have been surfacing? mustn't you have been surfacing? mustn't she have been surfacing? mustn't we have been surfacing? mustn't you have been surfacing? mustn't they have been surfacing?