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