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