I must look you must look he must look we must look you must look they must look
Forma com V-ing
I must be looking you must be looking he must be looking we must be looking you must be looking they must be looking
Perfeito
I must have looked you must have looked he must have looked we must have looked you must have looked they must have looked
Perfeito com V-ing
I must have been looking you must have been looking he must have been looking we must have been looking you must have been looking they must have been looking
Negação
Forma simple
I must not look you must not look he must not look we must not look you must not look they must not look
Forma com V-ing
I must not be looking you must not be looking he must not be looking we must not be looking you must not be looking they must not be looking
Perfeito
I must not have looked you must not have looked he must not have looked we must not have looked you must not have looked they must not have looked
Perfeito com V-ing
I must not have been looking you must not have been looking he must not have been looking we must not have been looking you must not have been looking they must not have been looking
Forma interrogativa
Forma simple
must I look? must you look? must he look? must we look? must you look? must they look?
Forma com V-ing
must I be looking? must you be looking? must he be looking? must we be looking? must you be looking? must they be looking?
Perfeito
must I have looked? must you have looked? must he have looked? must we have looked? must you have looked? must they have looked?
Perfeito com V-ing
must I have been looking? must you have been looking? must he have been looking? must we have been looking? must you have been looking? must they have been looking?
Forma interro-Negação
Forma simple
must I not look? must you not look? must he not look? must we not look? must you not look? must they not look?
Forma com V-ing
must I not be looking? must you not be looking? must he not be looking? must we not be looking? must you not be looking? must they not be looking?
Perfeito
must I not have looked? must you not have looked? must he not have looked? must we not have looked? must you not have looked? must they not have looked?
Perfeito com V-ing
must I not have been looking? must you not have been looking? must he not have been looking? must we not have been looking? must you not have been looking? must they not have been looking?