can tariff
Regular verb: tariff - tariffed- tariffed

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
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	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 	Perfect 	V-ing perfect 	
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	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 	Perfect 	V-ing perfect 	
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? 	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 	Perfect 	V-ing perfect 	
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? 	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?