I can birth you can birth she can birth we can birth you can birth they can birth
V-ing form
I can be birthing you can be birthing she can be birthing we can be birthing you can be birthing they can be birthing
Perfect
I can have birthed you can have birthed she can have birthed we can have birthed you can have birthed they can have birthed
V-ing perfect
I can have been birthing you can have been birthing she can have been birthing we can have been birthing you can have been birthing they can have been birthing
Negation
Simple form
I can't birth you can't birth she can't birth we can't birth you can't birth they can't birth
V-ing form
I can't be birthing you can't be birthing she can't be birthing we can't be birthing you can't be birthing they can't be birthing
Perfect
I can't have birthed you can't have birthed she can't have birthed we can't have birthed you can't have birthed they can't have birthed
V-ing perfect
I can't have been birthing you can't have been birthing she can't have been birthing we can't have been birthing you can't have been birthing they can't have been birthing
Interrogative form
Simple form
can I birth? can you birth? can she birth? can we birth? can you birth? can they birth?
V-ing form
can I be birthing? can you be birthing? can she be birthing? can we be birthing? can you be birthing? can they be birthing?
Perfect
can I have birthed? can you have birthed? can she have birthed? can we have birthed? can you have birthed? can they have birthed?
V-ing perfect
can I have been birthing? can you have been birthing? can she have been birthing? can we have been birthing? can you have been birthing? can they have been birthing?
Interro-negative form
Simple form
can't I birth? can't you birth? can't she birth? can't we birth? can't you birth? can't they birth?
V-ing form
can't I be birthing? can't you be birthing? can't she be birthing? can't we be birthing? can't you be birthing? can't they be birthing?
Perfect
can't I have birthed? can't you have birthed? can't she have birthed? can't we have birthed? can't you have birthed? can't they have birthed?
V-ing perfect
can't I have been birthing? can't you have been birthing? can't she have been birthing? can't we have been birthing? can't you have been birthing? can't they have been birthing?