must birth
Verbo regular: birth - birthed- birthed

Afirmación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I must birth
you must birth
he must birth
we must birth
you must birth
they must birth 	I must be birthing
you must be birthing
he must be birthing
we must be birthing
you must be birthing
they must be birthing	I must have birthed
you must have birthed
he must have birthed
we must have birthed
you must have birthed
they must have birthed	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 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I must not birth
you must not birth
he must not birth
we must not birth
you must not birth
they must not birth 	I must not be birthing
you must not be birthing
he must not be birthing
we must not be birthing
you must not be birthing
they must not be birthing	I must not have birthed
you must not have birthed
he must not have birthed
we must not have birthed
you must not have birthed
they must not have birthed	I must not have been birthing
you must not have been birthing
he must not have been birthing
we must not have been birthing
you must not have been birthing
they must not have been birthing	

Forma interrogativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
must I birth?
must you birth?
must he birth?
must we birth?
must you birth?
must they birth? 	must I be birthing?
must you be birthing?
must he be birthing?
must we be birthing?
must you be birthing?
must they be birthing? 	must I have birthed?
must you have birthed?
must he have birthed?
must we have birthed?
must you have birthed?
must they have birthed? 	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 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
must I not birth?
must you not birth?
must he not birth?
must we not birth?
must you not birth?
must they not birth? 	must I not be birthing?
must you not be birthing?
must he not be birthing?
must we not be birthing?
must you not be birthing?
must they not be birthing? 	must I not have birthed?
must you not have birthed?
must he not have birthed?
must we not have birthed?
must you not have birthed?
must they not have birthed? 	must I not have been birthing?
must you not have been birthing?
must he not have been birthing?
must we not have been birthing?
must you not have been birthing?
must they not have been birthing?