could refract
Regular verb: refract - refracted- refracted

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could refract
you could refract
she could refract
we could refract
you could refract
they could refract 	I could be refracting
you could be refracting
she could be refracting
we could be refracting
you could be refracting
they could be refracting	I could have refracted
you could have refracted
she could have refracted
we could have refracted
you could have refracted
they could have refracted	I could have been refracting
you could have been refracting
she could have been refracting
we could have been refracting
you could have been refracting
they could have been refracting	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could not refract
you could not refract
she could not refract
we could not refract
you could not refract
they could not refract 	I could not be refracting
you could not be refracting
she could not be refracting
we could not be refracting
you could not be refracting
they could not be refracting	I could not have refracted
you could not have refracted
she could not have refracted
we could not have refracted
you could not have refracted
they could not have refracted	I could not have been refracting
you could not have been refracting
she could not have been refracting
we could not have been refracting
you could not have been refracting
they could not have been refracting	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I refract?
could you refract?
could she refract?
could we refract?
could you refract?
could they refract? 	could I be refracting?
could you be refracting?
could she be refracting?
could we be refracting?
could you be refracting?
could they be refracting? 	could I have refracted?
could you have refracted?
could she have refracted?
could we have refracted?
could you have refracted?
could they have refracted? 	could I have been refracting?
could you have been refracting?
could she have been refracting?
could we have been refracting?
could you have been refracting?
could they have been refracting? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I not refract?
could you not refract?
could she not refract?
could we not refract?
could you not refract?
could they not refract? 	could I not be refracting?
could you not be refracting?
could she not be refracting?
could we not be refracting?
could you not be refracting?
could they not be refracting? 	could I not have refracted?
could you not have refracted?
could she not have refracted?
could we not have refracted?
could you not have refracted?
could they not have refracted? 	could I not have been refracting?
could you not have been refracting?
could she not have been refracting?
could we not have been refracting?
could you not have been refracting?
could they not have been refracting?