could tariff
Verbo regular: tariff - tariffed- tariffed

Afirmación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
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	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	

Negación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
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	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	

Forma interrogativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
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? 	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? 	

Forma interro-negativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
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? 	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?