I must serge you must serge she must serge we must serge you must serge they must serge
Forma con V-ing
I must be serging you must be serging she must be serging we must be serging you must be serging they must be serging
Perfecto
I must have serged you must have serged she must have serged we must have serged you must have serged they must have serged
Perfecto con V-ing
I must have been serging you must have been serging she must have been serging we must have been serging you must have been serging they must have been serging
Negación
Forma simple
I mustn't serge you mustn't serge she mustn't serge we mustn't serge you mustn't serge they mustn't serge
Forma con V-ing
I mustn't be serging you mustn't be serging she mustn't be serging we mustn't be serging you mustn't be serging they mustn't be serging
Perfecto
I mustn't have serged you mustn't have serged she mustn't have serged we mustn't have serged you mustn't have serged they mustn't have serged
Perfecto con V-ing
I mustn't have been serging you mustn't have been serging she mustn't have been serging we mustn't have been serging you mustn't have been serging they mustn't have been serging
Forma interrogativa
Forma simple
must I serge? must you serge? must she serge? must we serge? must you serge? must they serge?
Forma con V-ing
must I be serging? must you be serging? must she be serging? must we be serging? must you be serging? must they be serging?
Perfecto
must I have serged? must you have serged? must she have serged? must we have serged? must you have serged? must they have serged?
Perfecto con V-ing
must I have been serging? must you have been serging? must she have been serging? must we have been serging? must you have been serging? must they have been serging?
Forma interro-negativa
Forma simple
mustn't I serge? mustn't you serge? mustn't she serge? mustn't we serge? mustn't you serge? mustn't they serge?
Forma con V-ing
mustn't I be serging? mustn't you be serging? mustn't she be serging? mustn't we be serging? mustn't you be serging? mustn't they be serging?
Perfecto
mustn't I have serged? mustn't you have serged? mustn't she have serged? mustn't we have serged? mustn't you have serged? mustn't they have serged?
Perfecto con V-ing
mustn't I have been serging? mustn't you have been serging? mustn't she have been serging? mustn't we have been serging? mustn't you have been serging? mustn't they have been serging?