could birth
Regular verb: birth - birthed- birthed

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could birth
you could birth
she could birth
we could birth
you could birth
they could birth 	I could be birthing
you could be birthing
she could be birthing
we could be birthing
you could be birthing
they could be birthing	I could have birthed
you could have birthed
she could have birthed
we could have birthed
you could have birthed
they could have birthed	I could have been birthing
you could have been birthing
she could have been birthing
we could have been birthing
you could have been birthing
they could have been birthing	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could not birth
you could not birth
she could not birth
we could not birth
you could not birth
they could not birth 	I could not be birthing
you could not be birthing
she could not be birthing
we could not be birthing
you could not be birthing
they could not be birthing	I could not have birthed
you could not have birthed
she could not have birthed
we could not have birthed
you could not have birthed
they could not have birthed	I could not have been birthing
you could not have been birthing
she could not have been birthing
we could not have been birthing
you could not have been birthing
they could not have been birthing	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I birth?
could you birth?
could she birth?
could we birth?
could you birth?
could they birth? 	could I be birthing?
could you be birthing?
could she be birthing?
could we be birthing?
could you be birthing?
could they be birthing? 	could I have birthed?
could you have birthed?
could she have birthed?
could we have birthed?
could you have birthed?
could they have birthed? 	could I have been birthing?
could you have been birthing?
could she have been birthing?
could we have been birthing?
could you have been birthing?
could they have been birthing? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I not birth?
could you not birth?
could she not birth?
could we not birth?
could you not birth?
could they not birth? 	could I not be birthing?
could you not be birthing?
could she not be birthing?
could we not be birthing?
could you not be birthing?
could they not be birthing? 	could I not have birthed?
could you not have birthed?
could she not have birthed?
could we not have birthed?
could you not have birthed?
could they not have birthed? 	could I not have been birthing?
could you not have been birthing?
could she not have been birthing?
could we not have been birthing?
could you not have been birthing?
could they not have been birthing?