I must blacken you must blacken he must blacken we must blacken you must blacken they must blacken
Forma con V-ing
I must be blackening you must be blackening he must be blackening we must be blackening you must be blackening they must be blackening
Perfecto
I must have blackened you must have blackened he must have blackened we must have blackened you must have blackened they must have blackened
Perfecto con V-ing
I must have been blackening you must have been blackening he must have been blackening we must have been blackening you must have been blackening they must have been blackening
Negación
Forma simple
I must not blacken you must not blacken he must not blacken we must not blacken you must not blacken they must not blacken
Forma con V-ing
I must not be blackening you must not be blackening he must not be blackening we must not be blackening you must not be blackening they must not be blackening
Perfecto
I must not have blackened you must not have blackened he must not have blackened we must not have blackened you must not have blackened they must not have blackened
Perfecto con V-ing
I must not have been blackening you must not have been blackening he must not have been blackening we must not have been blackening you must not have been blackening they must not have been blackening
Forma interrogativa
Forma simple
must I blacken? must you blacken? must he blacken? must we blacken? must you blacken? must they blacken?
Forma con V-ing
must I be blackening? must you be blackening? must he be blackening? must we be blackening? must you be blackening? must they be blackening?
Perfecto
must I have blackened? must you have blackened? must he have blackened? must we have blackened? must you have blackened? must they have blackened?
Perfecto con V-ing
must I have been blackening? must you have been blackening? must he have been blackening? must we have been blackening? must you have been blackening? must they have been blackening?
Forma interro-negativa
Forma simple
must I not blacken? must you not blacken? must he not blacken? must we not blacken? must you not blacken? must they not blacken?
Forma con V-ing
must I not be blackening? must you not be blackening? must he not be blackening? must we not be blackening? must you not be blackening? must they not be blackening?
Perfecto
must I not have blackened? must you not have blackened? must he not have blackened? must we not have blackened? must you not have blackened? must they not have blackened?
Perfecto con V-ing
must I not have been blackening? must you not have been blackening? must he not have been blackening? must we not have been blackening? must you not have been blackening? must they not have been blackening?