I must upgrade you must upgrade she must upgrade we must upgrade you must upgrade they must upgrade
V-ing form
I must be upgrading you must be upgrading she must be upgrading we must be upgrading you must be upgrading they must be upgrading
Perfect
I must have upgraded you must have upgraded she 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 she must have been upgrading we must have been upgrading you must have been upgrading they must have been upgrading
Negation
Simple form
I mustn't upgrade you mustn't upgrade she mustn't upgrade we mustn't upgrade you mustn't upgrade they mustn't upgrade
V-ing form
I mustn't be upgrading you mustn't be upgrading she mustn't be upgrading we mustn't be upgrading you mustn't be upgrading they mustn't be upgrading
Perfect
I mustn't have upgraded you mustn't have upgraded she mustn't have upgraded we mustn't have upgraded you mustn't have upgraded they mustn't have upgraded
V-ing perfect
I mustn't have been upgrading you mustn't have been upgrading she mustn't have been upgrading we mustn't have been upgrading you mustn't have been upgrading they mustn't have been upgrading
Interrogative form
Simple form
must I upgrade? must you upgrade? must she upgrade? must we upgrade? must you upgrade? must they upgrade?
V-ing form
must I be upgrading? must you be upgrading? must she be upgrading? must we be upgrading? must you be upgrading? must they be upgrading?
Perfect
must I have upgraded? must you have upgraded? must she 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 she have been upgrading? must we have been upgrading? must you have been upgrading? must they have been upgrading?
Interro-negative form
Simple form
mustn't I upgrade? mustn't you upgrade? mustn't she upgrade? mustn't we upgrade? mustn't you upgrade? mustn't they upgrade?
V-ing form
mustn't I be upgrading? mustn't you be upgrading? mustn't she be upgrading? mustn't we be upgrading? mustn't you be upgrading? mustn't they be upgrading?
Perfect
mustn't I have upgraded? mustn't you have upgraded? mustn't she have upgraded? mustn't we have upgraded? mustn't you have upgraded? mustn't they have upgraded?
V-ing perfect
mustn't I have been upgrading? mustn't you have been upgrading? mustn't she have been upgrading? mustn't we have been upgrading? mustn't you have been upgrading? mustn't they have been upgrading?