I must install you must install he must install we must install you must install they must install
Forma con V-ing
I must be installing you must be installing he must be installing we must be installing you must be installing they must be installing
Perfecto
I must have installed you must have installed he must have installed we must have installed you must have installed they must have installed
Perfecto con V-ing
I must have been installing you must have been installing he must have been installing we must have been installing you must have been installing they must have been installing
Negación
Forma simple
I must not install you must not install he must not install we must not install you must not install they must not install
Forma con V-ing
I must not be installing you must not be installing he must not be installing we must not be installing you must not be installing they must not be installing
Perfecto
I must not have installed you must not have installed he must not have installed we must not have installed you must not have installed they must not have installed
Perfecto con V-ing
I must not have been installing you must not have been installing he must not have been installing we must not have been installing you must not have been installing they must not have been installing
Forma interrogativa
Forma simple
must I install? must you install? must he install? must we install? must you install? must they install?
Forma con V-ing
must I be installing? must you be installing? must he be installing? must we be installing? must you be installing? must they be installing?
Perfecto
must I have installed? must you have installed? must he have installed? must we have installed? must you have installed? must they have installed?
Perfecto con V-ing
must I have been installing? must you have been installing? must he have been installing? must we have been installing? must you have been installing? must they have been installing?
Forma interro-negativa
Forma simple
must I not install? must you not install? must he not install? must we not install? must you not install? must they not install?
Forma con V-ing
must I not be installing? must you not be installing? must he not be installing? must we not be installing? must you not be installing? must they not be installing?
Perfecto
must I not have installed? must you not have installed? must he not have installed? must we not have installed? must you not have installed? must they not have installed?
Perfecto con V-ing
must I not have been installing? must you not have been installing? must he not have been installing? must we not have been installing? must you not have been installing? must they not have been installing?