I must backdate you must backdate he must backdate we must backdate you must backdate they must backdate
Forma con V-ing
I must be backdating you must be backdating he must be backdating we must be backdating you must be backdating they must be backdating
Perfecto
I must have backdated you must have backdated he must have backdated we must have backdated you must have backdated they must have backdated
Perfecto con V-ing
I must have been backdating you must have been backdating he must have been backdating we must have been backdating you must have been backdating they must have been backdating
Negación
Forma simple
I must not backdate you must not backdate he must not backdate we must not backdate you must not backdate they must not backdate
Forma con V-ing
I must not be backdating you must not be backdating he must not be backdating we must not be backdating you must not be backdating they must not be backdating
Perfecto
I must not have backdated you must not have backdated he must not have backdated we must not have backdated you must not have backdated they must not have backdated
Perfecto con V-ing
I must not have been backdating you must not have been backdating he must not have been backdating we must not have been backdating you must not have been backdating they must not have been backdating
Forma interrogativa
Forma simple
must I backdate? must you backdate? must he backdate? must we backdate? must you backdate? must they backdate?
Forma con V-ing
must I be backdating? must you be backdating? must he be backdating? must we be backdating? must you be backdating? must they be backdating?
Perfecto
must I have backdated? must you have backdated? must he have backdated? must we have backdated? must you have backdated? must they have backdated?
Perfecto con V-ing
must I have been backdating? must you have been backdating? must he have been backdating? must we have been backdating? must you have been backdating? must they have been backdating?
Forma interro-negativa
Forma simple
must I not backdate? must you not backdate? must he not backdate? must we not backdate? must you not backdate? must they not backdate?
Forma con V-ing
must I not be backdating? must you not be backdating? must he not be backdating? must we not be backdating? must you not be backdating? must they not be backdating?
Perfecto
must I not have backdated? must you not have backdated? must he not have backdated? must we not have backdated? must you not have backdated? must they not have backdated?
Perfecto con V-ing
must I not have been backdating? must you not have been backdating? must he not have been backdating? must we not have been backdating? must you not have been backdating? must they not have been backdating?