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