I must check you must check he must check we must check you must check they must check
Forma com V-ing
I must be checking you must be checking he must be checking we must be checking you must be checking they must be checking
Perfeito
I must have checked you must have checked he must have checked we must have checked you must have checked they must have checked
Perfeito com V-ing
I must have been checking you must have been checking he must have been checking we must have been checking you must have been checking they must have been checking
Negação
Forma simple
I must not check you must not check he must not check we must not check you must not check they must not check
Forma com V-ing
I must not be checking you must not be checking he must not be checking we must not be checking you must not be checking they must not be checking
Perfeito
I must not have checked you must not have checked he must not have checked we must not have checked you must not have checked they must not have checked
Perfeito com V-ing
I must not have been checking you must not have been checking he must not have been checking we must not have been checking you must not have been checking they must not have been checking
Forma interrogativa
Forma simple
must I check? must you check? must he check? must we check? must you check? must they check?
Forma com V-ing
must I be checking? must you be checking? must he be checking? must we be checking? must you be checking? must they be checking?
Perfeito
must I have checked? must you have checked? must he have checked? must we have checked? must you have checked? must they have checked?
Perfeito com V-ing
must I have been checking? must you have been checking? must he have been checking? must we have been checking? must you have been checking? must they have been checking?
Forma interro-Negação
Forma simple
must I not check? must you not check? must he not check? must we not check? must you not check? must they not check?
Forma com V-ing
must I not be checking? must you not be checking? must he not be checking? must we not be checking? must you not be checking? must they not be checking?
Perfeito
must I not have checked? must you not have checked? must he not have checked? must we not have checked? must you not have checked? must they not have checked?
Perfeito com V-ing
must I not have been checking? must you not have been checking? must he not have been checking? must we not have been checking? must you not have been checking? must they not have been checking?