English verb conjugation
COULD FULFIL

Regular verb: fulfil - fulfilled - fulfilled

Affirmation

Simple form	V-ing form
I could fulfil you could fulfil he could fulfil we could fulfil you could fulfil they could fulfil	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 couldn't fulfil you couldn't fulfil he couldn't fulfil we couldn't fulfil you couldn't fulfil they couldn't fulfil	I couldn't be fulfilling you couldn't be fulfilling he 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 he 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 he 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 fulfil? could you fulfil? could he fulfil? could we fulfil? could you fulfil? could they fulfil?	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
couldn't I fulfil? couldn't you fulfil? couldn't he fulfil? couldn't we fulfil? couldn't you fulfil? couldn't they fulfil?	couldn't I be fulfilling? couldn't you be fulfilling? couldn't he 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 he 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 he have been fulfilling? couldn't we have been fulfilling? couldn't you have been fulfilling? couldn't they have been fulfilling?