Cuidado, este verbo pode não existir, a conjugação é dada como exemplo.
Afirmação
Forma simple
I must go down you must go down she must go down we must go down you must go down they must go down
Forma com V-ing
I must be go downing you must be go downing she must be go downing we must be go downing you must be go downing they must be go downing
Perfeito
I must have go downed you must have go downed she must have go downed we must have go downed you must have go downed they must have go downed
Perfeito com V-ing
I must have been go downing you must have been go downing she must have been go downing we must have been go downing you must have been go downing they must have been go downing
Negação
Forma simple
I mustn't go down you mustn't go down she mustn't go down we mustn't go down you mustn't go down they mustn't go down
Forma com V-ing
I mustn't be go downing you mustn't be go downing she mustn't be go downing we mustn't be go downing you mustn't be go downing they mustn't be go downing
Perfeito
I mustn't have go downed you mustn't have go downed she mustn't have go downed we mustn't have go downed you mustn't have go downed they mustn't have go downed
Perfeito com V-ing
I mustn't have been go downing you mustn't have been go downing she mustn't have been go downing we mustn't have been go downing you mustn't have been go downing they mustn't have been go downing
Forma interrogativa
Forma simple
must I go down? must you go down? must she go down? must we go down? must you go down? must they go down?
Forma com V-ing
must I be go downing? must you be go downing? must she be go downing? must we be go downing? must you be go downing? must they be go downing?
Perfeito
must I have go downed? must you have go downed? must she have go downed? must we have go downed? must you have go downed? must they have go downed?
Perfeito com V-ing
must I have been go downing? must you have been go downing? must she have been go downing? must we have been go downing? must you have been go downing? must they have been go downing?
Forma interro-Negação
Forma simple
mustn't I go down? mustn't you go down? mustn't she go down? mustn't we go down? mustn't you go down? mustn't they go down?
Forma com V-ing
mustn't I be go downing? mustn't you be go downing? mustn't she be go downing? mustn't we be go downing? mustn't you be go downing? mustn't they be go downing?
Perfeito
mustn't I have go downed? mustn't you have go downed? mustn't she have go downed? mustn't we have go downed? mustn't you have go downed? mustn't they have go downed?
Perfeito com V-ing
mustn't I have been go downing? mustn't you have been go downing? mustn't she have been go downing? mustn't we have been go downing? mustn't you have been go downing? mustn't they have been go downing?