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