English verb conjugation
COULD TARIFF

Regular verb: tariff - tariffed - tariffed

Affirmation

Simple form	V-ing form
I could tariff you could tariff she could tariff we could tariff you could tariff they could tariff	I could be tariffing you could be tariffing she could be tariffing we could be tariffing you could be tariffing they could be tariffing
Perfect	V-ing perfect
I could have tariffed you could have tariffed she could have tariffed we could have tariffed you could have tariffed they could have tariffed	I could have been tariffing you could have been tariffing she could have been tariffing we could have been tariffing you could have been tariffing they could have been tariffing

Negation

Simple form	V-ing form
I could not tariff you could not tariff she could not tariff we could not tariff you could not tariff they could not tariff	I could not be tariffing you could not be tariffing she could not be tariffing we could not be tariffing you could not be tariffing they could not be tariffing
Perfect	V-ing perfect
I could not have tariffed you could not have tariffed she could not have tariffed we could not have tariffed you could not have tariffed they could not have tariffed	I could not have been tariffing you could not have been tariffing she could not have been tariffing we could not have been tariffing you could not have been tariffing they could not have been tariffing

Interrogative form

Simple form	V-ing form
could I tariff? could you tariff? could she tariff? could we tariff? could you tariff? could they tariff?	could I be tariffing? could you be tariffing? could she be tariffing? could we be tariffing? could you be tariffing? could they be tariffing?
Perfect	V-ing perfect
could I have tariffed? could you have tariffed? could she have tariffed? could we have tariffed? could you have tariffed? could they have tariffed?	could I have been tariffing? could you have been tariffing? could she have been tariffing? could we have been tariffing? could you have been tariffing? could they have been tariffing?

Interro-negative form

Simple form	V-ing form
could I not tariff? could you not tariff? could she not tariff? could we not tariff? could you not tariff? could they not tariff?	could I not be tariffing? could you not be tariffing? could she not be tariffing? could we not be tariffing? could you not be tariffing? could they not be tariffing?
Perfect	V-ing perfect
could I not have tariffed? could you not have tariffed? could she not have tariffed? could we not have tariffed? could you not have tariffed? could they not have tariffed?	could I not have been tariffing? could you not have been tariffing? could she not have been tariffing? could we not have been tariffing? could you not have been tariffing? could they not have been tariffing?