I must harden you must harden she must harden we must harden you must harden they must harden
Forma con V-ing
I must be hardening you must be hardening she must be hardening we must be hardening you must be hardening they must be hardening
Perfecto
I must have hardened you must have hardened she must have hardened we must have hardened you must have hardened they must have hardened
Perfecto con V-ing
I must have been hardening you must have been hardening she must have been hardening we must have been hardening you must have been hardening they must have been hardening
Negación
Forma simple
I must not harden you must not harden she must not harden we must not harden you must not harden they must not harden
Forma con V-ing
I must not be hardening you must not be hardening she must not be hardening we must not be hardening you must not be hardening they must not be hardening
Perfecto
I must not have hardened you must not have hardened she must not have hardened we must not have hardened you must not have hardened they must not have hardened
Perfecto con V-ing
I must not have been hardening you must not have been hardening she must not have been hardening we must not have been hardening you must not have been hardening they must not have been hardening
Forma interrogativa
Forma simple
must I harden? must you harden? must she harden? must we harden? must you harden? must they harden?
Forma con V-ing
must I be hardening? must you be hardening? must she be hardening? must we be hardening? must you be hardening? must they be hardening?
Perfecto
must I have hardened? must you have hardened? must she have hardened? must we have hardened? must you have hardened? must they have hardened?
Perfecto con V-ing
must I have been hardening? must you have been hardening? must she have been hardening? must we have been hardening? must you have been hardening? must they have been hardening?
Forma interro-negativa
Forma simple
must I not harden? must you not harden? must she not harden? must we not harden? must you not harden? must they not harden?
Forma con V-ing
must I not be hardening? must you not be hardening? must she not be hardening? must we not be hardening? must you not be hardening? must they not be hardening?
Perfecto
must I not have hardened? must you not have hardened? must she not have hardened? must we not have hardened? must you not have hardened? must they not have hardened?
Perfecto con V-ing
must I not have been hardening? must you not have been hardening? must she not have been hardening? must we not have been hardening? must you not have been hardening? must they not have been hardening?