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