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