English verb conjugation
COULD FULFILL

Regular verb: fulfill - fulfilled - fulfilled

Affirmation

Simple form	V-ing form
I could fulfill you could fulfill she could fulfill we could fulfill you could fulfill they could fulfill	I could be fulfilling you could be fulfilling she 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 she 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 she 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 couldn't fulfill you couldn't fulfill she couldn't fulfill we couldn't fulfill you couldn't fulfill they couldn't fulfill	I couldn't be fulfilling you couldn't be fulfilling she couldn't be fulfilling we couldn't be fulfilling you couldn't be fulfilling they couldn't be fulfilling
Perfect	V-ing perfect
I couldn't have fulfilled you couldn't have fulfilled she couldn't have fulfilled we couldn't have fulfilled you couldn't have fulfilled they couldn't have fulfilled	I couldn't have been fulfilling you couldn't have been fulfilling she couldn't have been fulfilling we couldn't have been fulfilling you couldn't have been fulfilling they couldn't have been fulfilling

Interrogative form

Simple form	V-ing form
could I fulfill? could you fulfill? could she fulfill? could we fulfill? could you fulfill? could they fulfill?	could I be fulfilling? could you be fulfilling? could she 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 she 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 she 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
couldn't I fulfill? couldn't you fulfill? couldn't she fulfill? couldn't we fulfill? couldn't you fulfill? couldn't they fulfill?	couldn't I be fulfilling? couldn't you be fulfilling? couldn't she be fulfilling? couldn't we be fulfilling? couldn't you be fulfilling? couldn't they be fulfilling?
Perfect	V-ing perfect
couldn't I have fulfilled? couldn't you have fulfilled? couldn't she have fulfilled? couldn't we have fulfilled? couldn't you have fulfilled? couldn't they have fulfilled?	couldn't I have been fulfilling? couldn't you have been fulfilling? couldn't she have been fulfilling? couldn't we have been fulfilling? couldn't you have been fulfilling? couldn't they have been fulfilling?