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