English verb conjugation
COULD REFRACT

Regular verb: refract - refracted - refracted

Affirmation

Simple form	V-ing form
I could refract you could refract he could refract we could refract you could refract they could refract	I could be refracting you could be refracting he could be refracting we could be refracting you could be refracting they could be refracting
Perfect	V-ing perfect
I could have refracted you could have refracted he 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 he 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
I couldn't refract you couldn't refract he couldn't refract we couldn't refract you couldn't refract they couldn't refract	I couldn't be refracting you couldn't be refracting he couldn't be refracting we couldn't be refracting you couldn't be refracting they couldn't be refracting
Perfect	V-ing perfect
I couldn't have refracted you couldn't have refracted he couldn't have refracted we couldn't have refracted you couldn't have refracted they couldn't have refracted	I couldn't have been refracting you couldn't have been refracting he couldn't have been refracting we couldn't have been refracting you couldn't have been refracting they couldn't have been refracting

Interrogative form

Simple form	V-ing form
could I refract? could you refract? could he refract? could we refract? could you refract? could they refract?	could I be refracting? could you be refracting? could he be refracting? could we be refracting? could you be refracting? could they be refracting?
Perfect	V-ing perfect
could I have refracted? could you have refracted? could he 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 he 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
couldn't I refract? couldn't you refract? couldn't he refract? couldn't we refract? couldn't you refract? couldn't they refract?	couldn't I be refracting? couldn't you be refracting? couldn't he be refracting? couldn't we be refracting? couldn't you be refracting? couldn't they be refracting?
Perfect	V-ing perfect
couldn't I have refracted? couldn't you have refracted? couldn't he have refracted? couldn't we have refracted? couldn't you have refracted? couldn't they have refracted?	couldn't I have been refracting? couldn't you have been refracting? couldn't he have been refracting? couldn't we have been refracting? couldn't you have been refracting? couldn't they have been refracting?