I must owe you must owe he must owe we must owe you must owe they must owe
V-ing form
I must be owing you must be owing he must be owing we must be owing you must be owing they must be owing
Perfect
I must have owed you must have owed he must have owed we must have owed you must have owed they must have owed
V-ing perfect
I must have been owing you must have been owing he must have been owing we must have been owing you must have been owing they must have been owing
Negation
Simple form
I mustn't owe you mustn't owe he mustn't owe we mustn't owe you mustn't owe they mustn't owe
V-ing form
I mustn't be owing you mustn't be owing he mustn't be owing we mustn't be owing you mustn't be owing they mustn't be owing
Perfect
I mustn't have owed you mustn't have owed he mustn't have owed we mustn't have owed you mustn't have owed they mustn't have owed
V-ing perfect
I mustn't have been owing you mustn't have been owing he mustn't have been owing we mustn't have been owing you mustn't have been owing they mustn't have been owing
Interrogative form
Simple form
must I owe? must you owe? must he owe? must we owe? must you owe? must they owe?
V-ing form
must I be owing? must you be owing? must he be owing? must we be owing? must you be owing? must they be owing?
Perfect
must I have owed? must you have owed? must he have owed? must we have owed? must you have owed? must they have owed?
V-ing perfect
must I have been owing? must you have been owing? must he have been owing? must we have been owing? must you have been owing? must they have been owing?
Interro-negative form
Simple form
mustn't I owe? mustn't you owe? mustn't he owe? mustn't we owe? mustn't you owe? mustn't they owe?
V-ing form
mustn't I be owing? mustn't you be owing? mustn't he be owing? mustn't we be owing? mustn't you be owing? mustn't they be owing?
Perfect
mustn't I have owed? mustn't you have owed? mustn't he have owed? mustn't we have owed? mustn't you have owed? mustn't they have owed?
V-ing perfect
mustn't I have been owing? mustn't you have been owing? mustn't he have been owing? mustn't we have been owing? mustn't you have been owing? mustn't they have been owing?