I must database you must database he must database we must database you must database they must database
V-ing form
I must be databasing you must be databasing he must be databasing we must be databasing you must be databasing they must be databasing
Perfect
I must have databased you must have databased he 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 he 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 he 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 he 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 he 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 he 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 he database? must we database? must you database? must they database?
V-ing form
must I be databasing? must you be databasing? must he be databasing? must we be databasing? must you be databasing? must they be databasing?
Perfect
must I have databased? must you have databased? must he 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 he 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 he 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 he 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 he 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 he have been databasing? mustn't we have been databasing? mustn't you have been databasing? mustn't they have been databasing?