I must greaten you must greaten she must greaten we must greaten you must greaten they must greaten
V-ing form
I must be greatening you must be greatening she must be greatening we must be greatening you must be greatening they must be greatening
Perfect
I must have greatened you must have greatened she must have greatened we must have greatened you must have greatened they must have greatened
V-ing perfect
I must have been greatening you must have been greatening she must have been greatening we must have been greatening you must have been greatening they must have been greatening
Negation
Simple form
I must not greaten you must not greaten she must not greaten we must not greaten you must not greaten they must not greaten
V-ing form
I must not be greatening you must not be greatening she must not be greatening we must not be greatening you must not be greatening they must not be greatening
Perfect
I must not have greatened you must not have greatened she must not have greatened we must not have greatened you must not have greatened they must not have greatened
V-ing perfect
I must not have been greatening you must not have been greatening she must not have been greatening we must not have been greatening you must not have been greatening they must not have been greatening
Interrogative form
Simple form
must I greaten? must you greaten? must she greaten? must we greaten? must you greaten? must they greaten?
V-ing form
must I be greatening? must you be greatening? must she be greatening? must we be greatening? must you be greatening? must they be greatening?
Perfect
must I have greatened? must you have greatened? must she have greatened? must we have greatened? must you have greatened? must they have greatened?
V-ing perfect
must I have been greatening? must you have been greatening? must she have been greatening? must we have been greatening? must you have been greatening? must they have been greatening?
Interro-negative form
Simple form
must I not greaten? must you not greaten? must she not greaten? must we not greaten? must you not greaten? must they not greaten?
V-ing form
must I not be greatening? must you not be greatening? must she not be greatening? must we not be greatening? must you not be greatening? must they not be greatening?
Perfect
must I not have greatened? must you not have greatened? must she not have greatened? must we not have greatened? must you not have greatened? must they not have greatened?
V-ing perfect
must I not have been greatening? must you not have been greatening? must she not have been greatening? must we not have been greatening? must you not have been greatening? must they not have been greatening?