could bow
Regular verb: bow - bowed- bowed

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could bow
you could bow
he could bow
we could bow
you could bow
they could bow 	I could be bowing
you could be bowing
he could be bowing
we could be bowing
you could be bowing
they could be bowing	I could have bowed
you could have bowed
he could have bowed
we could have bowed
you could have bowed
they could have bowed	I could have been bowing
you could have been bowing
he could have been bowing
we could have been bowing
you could have been bowing
they could have been bowing	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I couldn't bow
you couldn't bow
he couldn't bow
we couldn't bow
you couldn't bow
they couldn't bow 	I couldn't be bowing
you couldn't be bowing
he couldn't be bowing
we couldn't be bowing
you couldn't be bowing
they couldn't be bowing	I couldn't have bowed
you couldn't have bowed
he couldn't have bowed
we couldn't have bowed
you couldn't have bowed
they couldn't have bowed	I couldn't have been bowing
you couldn't have been bowing
he couldn't have been bowing
we couldn't have been bowing
you couldn't have been bowing
they couldn't have been bowing	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I bow?
could you bow?
could he bow?
could we bow?
could you bow?
could they bow? 	could I be bowing?
could you be bowing?
could he be bowing?
could we be bowing?
could you be bowing?
could they be bowing? 	could I have bowed?
could you have bowed?
could he have bowed?
could we have bowed?
could you have bowed?
could they have bowed? 	could I have been bowing?
could you have been bowing?
could he have been bowing?
could we have been bowing?
could you have been bowing?
could they have been bowing? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
couldn't I bow?
couldn't you bow?
couldn't he bow?
couldn't we bow?
couldn't you bow?
couldn't they bow? 	couldn't I be bowing?
couldn't you be bowing?
couldn't he be bowing?
couldn't we be bowing?
couldn't you be bowing?
couldn't they be bowing? 	couldn't I have bowed?
couldn't you have bowed?
couldn't he have bowed?
couldn't we have bowed?
couldn't you have bowed?
couldn't they have bowed? 	couldn't I have been bowing?
couldn't you have been bowing?
couldn't he have been bowing?
couldn't we have been bowing?
couldn't you have been bowing?
couldn't they have been bowing?