could decode
Verbo regular: decode - decoded- decoded

Afirmação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I could decode
you could decode
he could decode
we could decode
you could decode
they could decode 	I could be decoding
you could be decoding
he could be decoding
we could be decoding
you could be decoding
they could be decoding	I could have decoded
you could have decoded
he could have decoded
we could have decoded
you could have decoded
they could have decoded	I could have been decoding
you could have been decoding
he could have been decoding
we could have been decoding
you could have been decoding
they could have been decoding	

Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I couldn't decode
you couldn't decode
he couldn't decode
we couldn't decode
you couldn't decode
they couldn't decode 	I couldn't be decoding
you couldn't be decoding
he couldn't be decoding
we couldn't be decoding
you couldn't be decoding
they couldn't be decoding	I couldn't have decoded
you couldn't have decoded
he couldn't have decoded
we couldn't have decoded
you couldn't have decoded
they couldn't have decoded	I couldn't have been decoding
you couldn't have been decoding
he couldn't have been decoding
we couldn't have been decoding
you couldn't have been decoding
they couldn't have been decoding	

Forma interrogativa 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
could I decode?
could you decode?
could he decode?
could we decode?
could you decode?
could they decode? 	could I be decoding?
could you be decoding?
could he be decoding?
could we be decoding?
could you be decoding?
could they be decoding? 	could I have decoded?
could you have decoded?
could he have decoded?
could we have decoded?
could you have decoded?
could they have decoded? 	could I have been decoding?
could you have been decoding?
could he have been decoding?
could we have been decoding?
could you have been decoding?
could they have been decoding? 	

Forma interro-Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
couldn't I decode?
couldn't you decode?
couldn't he decode?
couldn't we decode?
couldn't you decode?
couldn't they decode? 	couldn't I be decoding?
couldn't you be decoding?
couldn't he be decoding?
couldn't we be decoding?
couldn't you be decoding?
couldn't they be decoding? 	couldn't I have decoded?
couldn't you have decoded?
couldn't he have decoded?
couldn't we have decoded?
couldn't you have decoded?
couldn't they have decoded? 	couldn't I have been decoding?
couldn't you have been decoding?
couldn't he have been decoding?
couldn't we have been decoding?
couldn't you have been decoding?
couldn't they have been decoding?