could oil
Verbo regular: oil - oiled- oiled

Afirmación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I could oil
you could oil
he could oil
we could oil
you could oil
they could oil 	I could be oiling
you could be oiling
he could be oiling
we could be oiling
you could be oiling
they could be oiling	I could have oiled
you could have oiled
he could have oiled
we could have oiled
you could have oiled
they could have oiled	I could have been oiling
you could have been oiling
he could have been oiling
we could have been oiling
you could have been oiling
they could have been oiling	

Negación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I couldn't oil
you couldn't oil
he couldn't oil
we couldn't oil
you couldn't oil
they couldn't oil 	I couldn't be oiling
you couldn't be oiling
he couldn't be oiling
we couldn't be oiling
you couldn't be oiling
they couldn't be oiling	I couldn't have oiled
you couldn't have oiled
he couldn't have oiled
we couldn't have oiled
you couldn't have oiled
they couldn't have oiled	I couldn't have been oiling
you couldn't have been oiling
he couldn't have been oiling
we couldn't have been oiling
you couldn't have been oiling
they couldn't have been oiling	

Forma interrogativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
could I oil?
could you oil?
could he oil?
could we oil?
could you oil?
could they oil? 	could I be oiling?
could you be oiling?
could he be oiling?
could we be oiling?
could you be oiling?
could they be oiling? 	could I have oiled?
could you have oiled?
could he have oiled?
could we have oiled?
could you have oiled?
could they have oiled? 	could I have been oiling?
could you have been oiling?
could he have been oiling?
could we have been oiling?
could you have been oiling?
could they have been oiling? 	

Forma interro-negativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
couldn't I oil?
couldn't you oil?
couldn't he oil?
couldn't we oil?
couldn't you oil?
couldn't they oil? 	couldn't I be oiling?
couldn't you be oiling?
couldn't he be oiling?
couldn't we be oiling?
couldn't you be oiling?
couldn't they be oiling? 	couldn't I have oiled?
couldn't you have oiled?
couldn't he have oiled?
couldn't we have oiled?
couldn't you have oiled?
couldn't they have oiled? 	couldn't I have been oiling?
couldn't you have been oiling?
couldn't he have been oiling?
couldn't we have been oiling?
couldn't you have been oiling?
couldn't they have been oiling?