English verb conjugation
CAN TARIFF

Regular verb: tariff - tariffed - tariffed

Affirmation

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

Negation

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

Interrogative form

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

Interro-negative form

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