I must serge you must serge he must serge we must serge you must serge they must serge
Forme en V-ing
I must be serging you must be serging he must be serging we must be serging you must be serging they must be serging
Perfect
I must have serged you must have serged he must have serged we must have serged you must have serged they must have serged
Perfect en V-ing
I must have been serging you must have been serging he must have been serging we must have been serging you must have been serging they must have been serging
Négation
Forme simple
I mustn't serge you mustn't serge he mustn't serge we mustn't serge you mustn't serge they mustn't serge
Forme en V-ing
I mustn't be serging you mustn't be serging he mustn't be serging we mustn't be serging you mustn't be serging they mustn't be serging
Perfect
I mustn't have serged you mustn't have serged he mustn't have serged we mustn't have serged you mustn't have serged they mustn't have serged
Perfect en V-ing
I mustn't have been serging you mustn't have been serging he mustn't have been serging we mustn't have been serging you mustn't have been serging they mustn't have been serging
Forme interrogative
Forme simple
must I serge? must you serge? must he serge? must we serge? must you serge? must they serge?
Forme en V-ing
must I be serging? must you be serging? must he be serging? must we be serging? must you be serging? must they be serging?
Perfect
must I have serged? must you have serged? must he have serged? must we have serged? must you have serged? must they have serged?
Perfect en V-ing
must I have been serging? must you have been serging? must he have been serging? must we have been serging? must you have been serging? must they have been serging?
Forme interro-négative
Forme simple
mustn't I serge? mustn't you serge? mustn't he serge? mustn't we serge? mustn't you serge? mustn't they serge?
Forme en V-ing
mustn't I be serging? mustn't you be serging? mustn't he be serging? mustn't we be serging? mustn't you be serging? mustn't they be serging?
Perfect
mustn't I have serged? mustn't you have serged? mustn't he have serged? mustn't we have serged? mustn't you have serged? mustn't they have serged?
Perfect en V-ing
mustn't I have been serging? mustn't you have been serging? mustn't he have been serging? mustn't we have been serging? mustn't you have been serging? mustn't they have been serging?