English verb conjugation
COULD TARIFF

Regular verb: tariff - tariffed - tariffed

Affirmation

Simple form	V-ing form
I could tariff you could tariff he could tariff we could tariff you could tariff they could tariff	I could be tariffing you could be tariffing he 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 he 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 he 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 couldn't tariff you couldn't tariff he couldn't tariff we couldn't tariff you couldn't tariff they couldn't tariff	I couldn't be tariffing you couldn't be tariffing he couldn't be tariffing we couldn't be tariffing you couldn't be tariffing they couldn't be tariffing
Perfect	V-ing perfect
I couldn't have tariffed you couldn't have tariffed he couldn't have tariffed we couldn't have tariffed you couldn't have tariffed they couldn't have tariffed	I couldn't have been tariffing you couldn't have been tariffing he couldn't have been tariffing we couldn't have been tariffing you couldn't have been tariffing they couldn't have been tariffing

Interrogative form

Simple form	V-ing form
could I tariff? could you tariff? could he tariff? could we tariff? could you tariff? could they tariff?	could I be tariffing? could you be tariffing? could he 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 he 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 he 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
couldn't I tariff? couldn't you tariff? couldn't he tariff? couldn't we tariff? couldn't you tariff? couldn't they tariff?	couldn't I be tariffing? couldn't you be tariffing? couldn't he be tariffing? couldn't we be tariffing? couldn't you be tariffing? couldn't they be tariffing?
Perfect	V-ing perfect
couldn't I have tariffed? couldn't you have tariffed? couldn't he have tariffed? couldn't we have tariffed? couldn't you have tariffed? couldn't they have tariffed?	couldn't I have been tariffing? couldn't you have been tariffing? couldn't he have been tariffing? couldn't we have been tariffing? couldn't you have been tariffing? couldn't they have been tariffing?