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