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 cannot tariff you cannot tariff he cannot tariff we cannot tariff you cannot tariff they cannot tariff	I cannot be tariffing you cannot be tariffing he cannot be tariffing we cannot be tariffing you cannot be tariffing they cannot be tariffing
Perfect	V-ing perfect
I cannot have tariffed you cannot have tariffed he cannot have tariffed we cannot have tariffed you cannot have tariffed they cannot have tariffed	I cannot have been tariffing you cannot have been tariffing he cannot have been tariffing we cannot have been tariffing you cannot have been tariffing they cannot 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 I not tariff? can you not tariff? can he not tariff? can we not tariff? can you not tariff? can they not tariff?	can I not be tariffing? can you not be tariffing? can he not be tariffing? can we not be tariffing? can you not be tariffing? can they not be tariffing?
Perfect	V-ing perfect
can I not have tariffed? can you not have tariffed? can he not have tariffed? can we not have tariffed? can you not have tariffed? can they not have tariffed?	can I not have been tariffing? can you not have been tariffing? can he not have been tariffing? can we not have been tariffing? can you not have been tariffing? can they not have been tariffing?