I must enliven you must enliven he must enliven we must enliven you must enliven they must enliven
V-ing form
I must be enlivening you must be enlivening he must be enlivening we must be enlivening you must be enlivening they must be enlivening
Perfect
I must have enlivened you must have enlivened he must have enlivened we must have enlivened you must have enlivened they must have enlivened
V-ing perfect
I must have been enlivening you must have been enlivening he must have been enlivening we must have been enlivening you must have been enlivening they must have been enlivening
Negation
Simple form
I must not enliven you must not enliven he must not enliven we must not enliven you must not enliven they must not enliven
V-ing form
I must not be enlivening you must not be enlivening he must not be enlivening we must not be enlivening you must not be enlivening they must not be enlivening
Perfect
I must not have enlivened you must not have enlivened he must not have enlivened we must not have enlivened you must not have enlivened they must not have enlivened
V-ing perfect
I must not have been enlivening you must not have been enlivening he must not have been enlivening we must not have been enlivening you must not have been enlivening they must not have been enlivening
Interrogative form
Simple form
must I enliven? must you enliven? must he enliven? must we enliven? must you enliven? must they enliven?
V-ing form
must I be enlivening? must you be enlivening? must he be enlivening? must we be enlivening? must you be enlivening? must they be enlivening?
Perfect
must I have enlivened? must you have enlivened? must he have enlivened? must we have enlivened? must you have enlivened? must they have enlivened?
V-ing perfect
must I have been enlivening? must you have been enlivening? must he have been enlivening? must we have been enlivening? must you have been enlivening? must they have been enlivening?
Interro-negative form
Simple form
must I not enliven? must you not enliven? must he not enliven? must we not enliven? must you not enliven? must they not enliven?
V-ing form
must I not be enlivening? must you not be enlivening? must he not be enlivening? must we not be enlivening? must you not be enlivening? must they not be enlivening?
Perfect
must I not have enlivened? must you not have enlivened? must he not have enlivened? must we not have enlivened? must you not have enlivened? must they not have enlivened?
V-ing perfect
must I not have been enlivening? must you not have been enlivening? must he not have been enlivening? must we not have been enlivening? must you not have been enlivening? must they not have been enlivening?