English verb conjugation
COULD FULFILL

Regular verb: fulfill - fulfilled - fulfilled

Affirmation

Simple form	V-ing form
I could fulfill you could fulfill he could fulfill we could fulfill you could fulfill they could fulfill	I could be fulfilling you could be fulfilling he could be fulfilling we could be fulfilling you could be fulfilling they could be fulfilling
Perfect	V-ing perfect
I could have fulfilled you could have fulfilled he could have fulfilled we could have fulfilled you could have fulfilled they could have fulfilled	I could have been fulfilling you could have been fulfilling he could have been fulfilling we could have been fulfilling you could have been fulfilling they could have been fulfilling

Negation

Simple form	V-ing form
I could not fulfill you could not fulfill he could not fulfill we could not fulfill you could not fulfill they could not fulfill	I could not be fulfilling you could not be fulfilling he could not be fulfilling we could not be fulfilling you could not be fulfilling they could not be fulfilling
Perfect	V-ing perfect
I could not have fulfilled you could not have fulfilled he could not have fulfilled we could not have fulfilled you could not have fulfilled they could not have fulfilled	I could not have been fulfilling you could not have been fulfilling he could not have been fulfilling we could not have been fulfilling you could not have been fulfilling they could not have been fulfilling

Interrogative form

Simple form	V-ing form
could I fulfill? could you fulfill? could he fulfill? could we fulfill? could you fulfill? could they fulfill?	could I be fulfilling? could you be fulfilling? could he be fulfilling? could we be fulfilling? could you be fulfilling? could they be fulfilling?
Perfect	V-ing perfect
could I have fulfilled? could you have fulfilled? could he have fulfilled? could we have fulfilled? could you have fulfilled? could they have fulfilled?	could I have been fulfilling? could you have been fulfilling? could he have been fulfilling? could we have been fulfilling? could you have been fulfilling? could they have been fulfilling?

Interro-negative form

Simple form	V-ing form
could I not fulfill? could you not fulfill? could he not fulfill? could we not fulfill? could you not fulfill? could they not fulfill?	could I not be fulfilling? could you not be fulfilling? could he not be fulfilling? could we not be fulfilling? could you not be fulfilling? could they not be fulfilling?
Perfect	V-ing perfect
could I not have fulfilled? could you not have fulfilled? could he not have fulfilled? could we not have fulfilled? could you not have fulfilled? could they not have fulfilled?	could I not have been fulfilling? could you not have been fulfilling? could he not have been fulfilling? could we not have been fulfilling? could you not have been fulfilling? could they not have been fulfilling?