I must upgrade you must upgrade he must upgrade we must upgrade you must upgrade they must upgrade
V-ing form
I must be upgrading you must be upgrading he must be upgrading we must be upgrading you must be upgrading they must be upgrading
Perfect
I must have upgraded you must have upgraded he must have upgraded we must have upgraded you must have upgraded they must have upgraded
V-ing perfect
I must have been upgrading you must have been upgrading he must have been upgrading we must have been upgrading you must have been upgrading they must have been upgrading
Negation
Simple form
I must not upgrade you must not upgrade he must not upgrade we must not upgrade you must not upgrade they must not upgrade
V-ing form
I must not be upgrading you must not be upgrading he must not be upgrading we must not be upgrading you must not be upgrading they must not be upgrading
Perfect
I must not have upgraded you must not have upgraded he must not have upgraded we must not have upgraded you must not have upgraded they must not have upgraded
V-ing perfect
I must not have been upgrading you must not have been upgrading he must not have been upgrading we must not have been upgrading you must not have been upgrading they must not have been upgrading
Interrogative form
Simple form
must I upgrade? must you upgrade? must he upgrade? must we upgrade? must you upgrade? must they upgrade?
V-ing form
must I be upgrading? must you be upgrading? must he be upgrading? must we be upgrading? must you be upgrading? must they be upgrading?
Perfect
must I have upgraded? must you have upgraded? must he have upgraded? must we have upgraded? must you have upgraded? must they have upgraded?
V-ing perfect
must I have been upgrading? must you have been upgrading? must he have been upgrading? must we have been upgrading? must you have been upgrading? must they have been upgrading?
Interro-negative form
Simple form
must I not upgrade? must you not upgrade? must he not upgrade? must we not upgrade? must you not upgrade? must they not upgrade?
V-ing form
must I not be upgrading? must you not be upgrading? must he not be upgrading? must we not be upgrading? must you not be upgrading? must they not be upgrading?
Perfect
must I not have upgraded? must you not have upgraded? must he not have upgraded? must we not have upgraded? must you not have upgraded? must they not have upgraded?
V-ing perfect
must I not have been upgrading? must you not have been upgrading? must he not have been upgrading? must we not have been upgrading? must you not have been upgrading? must they not have been upgrading?