I must descend you must descend she must descend we must descend you must descend they must descend
Forme en V-ing
I must be descending you must be descending she must be descending we must be descending you must be descending they must be descending
Perfect
I must have descended you must have descended she must have descended we must have descended you must have descended they must have descended
Perfect en V-ing
I must have been descending you must have been descending she must have been descending we must have been descending you must have been descending they must have been descending
Négation
Forme simple
I mustn't descend you mustn't descend she mustn't descend we mustn't descend you mustn't descend they mustn't descend
Forme en V-ing
I mustn't be descending you mustn't be descending she mustn't be descending we mustn't be descending you mustn't be descending they mustn't be descending
Perfect
I mustn't have descended you mustn't have descended she mustn't have descended we mustn't have descended you mustn't have descended they mustn't have descended
Perfect en V-ing
I mustn't have been descending you mustn't have been descending she mustn't have been descending we mustn't have been descending you mustn't have been descending they mustn't have been descending
Forme interrogative
Forme simple
must I descend? must you descend? must she descend? must we descend? must you descend? must they descend?
Forme en V-ing
must I be descending? must you be descending? must she be descending? must we be descending? must you be descending? must they be descending?
Perfect
must I have descended? must you have descended? must she have descended? must we have descended? must you have descended? must they have descended?
Perfect en V-ing
must I have been descending? must you have been descending? must she have been descending? must we have been descending? must you have been descending? must they have been descending?
Forme interro-négative
Forme simple
mustn't I descend? mustn't you descend? mustn't she descend? mustn't we descend? mustn't you descend? mustn't they descend?
Forme en V-ing
mustn't I be descending? mustn't you be descending? mustn't she be descending? mustn't we be descending? mustn't you be descending? mustn't they be descending?
Perfect
mustn't I have descended? mustn't you have descended? mustn't she have descended? mustn't we have descended? mustn't you have descended? mustn't they have descended?
Perfect en V-ing
mustn't I have been descending? mustn't you have been descending? mustn't she have been descending? mustn't we have been descending? mustn't you have been descending? mustn't they have been descending?