I must buck you must buck he must buck we must buck you must buck they must buck
Forma con V-ing
I must be bucking you must be bucking he must be bucking we must be bucking you must be bucking they must be bucking
Perfecto
I must have bucked you must have bucked he must have bucked we must have bucked you must have bucked they must have bucked
Perfecto con V-ing
I must have been bucking you must have been bucking he must have been bucking we must have been bucking you must have been bucking they must have been bucking
Negación
Forma simple
I mustn't buck you mustn't buck he mustn't buck we mustn't buck you mustn't buck they mustn't buck
Forma con V-ing
I mustn't be bucking you mustn't be bucking he mustn't be bucking we mustn't be bucking you mustn't be bucking they mustn't be bucking
Perfecto
I mustn't have bucked you mustn't have bucked he mustn't have bucked we mustn't have bucked you mustn't have bucked they mustn't have bucked
Perfecto con V-ing
I mustn't have been bucking you mustn't have been bucking he mustn't have been bucking we mustn't have been bucking you mustn't have been bucking they mustn't have been bucking
Forma interrogativa
Forma simple
must I buck? must you buck? must he buck? must we buck? must you buck? must they buck?
Forma con V-ing
must I be bucking? must you be bucking? must he be bucking? must we be bucking? must you be bucking? must they be bucking?
Perfecto
must I have bucked? must you have bucked? must he have bucked? must we have bucked? must you have bucked? must they have bucked?
Perfecto con V-ing
must I have been bucking? must you have been bucking? must he have been bucking? must we have been bucking? must you have been bucking? must they have been bucking?
Forma interro-negativa
Forma simple
mustn't I buck? mustn't you buck? mustn't he buck? mustn't we buck? mustn't you buck? mustn't they buck?
Forma con V-ing
mustn't I be bucking? mustn't you be bucking? mustn't he be bucking? mustn't we be bucking? mustn't you be bucking? mustn't they be bucking?
Perfecto
mustn't I have bucked? mustn't you have bucked? mustn't he have bucked? mustn't we have bucked? mustn't you have bucked? mustn't they have bucked?
Perfecto con V-ing
mustn't I have been bucking? mustn't you have been bucking? mustn't he have been bucking? mustn't we have been bucking? mustn't you have been bucking? mustn't they have been bucking?