could decay
Verbo regular: decay - decayed- decayed

Afirmación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I could decay
you could decay
she could decay
we could decay
you could decay
they could decay 	I could be decaying
you could be decaying
she could be decaying
we could be decaying
you could be decaying
they could be decaying	I could have decayed
you could have decayed
she could have decayed
we could have decayed
you could have decayed
they could have decayed	I could have been decaying
you could have been decaying
she could have been decaying
we could have been decaying
you could have been decaying
they could have been decaying	

Negación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I couldn't decay
you couldn't decay
she couldn't decay
we couldn't decay
you couldn't decay
they couldn't decay 	I couldn't be decaying
you couldn't be decaying
she couldn't be decaying
we couldn't be decaying
you couldn't be decaying
they couldn't be decaying	I couldn't have decayed
you couldn't have decayed
she couldn't have decayed
we couldn't have decayed
you couldn't have decayed
they couldn't have decayed	I couldn't have been decaying
you couldn't have been decaying
she couldn't have been decaying
we couldn't have been decaying
you couldn't have been decaying
they couldn't have been decaying	

Forma interrogativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
could I decay?
could you decay?
could she decay?
could we decay?
could you decay?
could they decay? 	could I be decaying?
could you be decaying?
could she be decaying?
could we be decaying?
could you be decaying?
could they be decaying? 	could I have decayed?
could you have decayed?
could she have decayed?
could we have decayed?
could you have decayed?
could they have decayed? 	could I have been decaying?
could you have been decaying?
could she have been decaying?
could we have been decaying?
could you have been decaying?
could they have been decaying? 	

Forma interro-negativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
couldn't I decay?
couldn't you decay?
couldn't she decay?
couldn't we decay?
couldn't you decay?
couldn't they decay? 	couldn't I be decaying?
couldn't you be decaying?
couldn't she be decaying?
couldn't we be decaying?
couldn't you be decaying?
couldn't they be decaying? 	couldn't I have decayed?
couldn't you have decayed?
couldn't she have decayed?
couldn't we have decayed?
couldn't you have decayed?
couldn't they have decayed? 	couldn't I have been decaying?
couldn't you have been decaying?
couldn't she have been decaying?
couldn't we have been decaying?
couldn't you have been decaying?
couldn't they have been decaying?