could treble
Verbo regular: treble - trebled- trebled

Afirmación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I could treble
you could treble
he could treble
we could treble
you could treble
they could treble 	I could be trebling
you could be trebling
he could be trebling
we could be trebling
you could be trebling
they could be trebling	I could have trebled
you could have trebled
he could have trebled
we could have trebled
you could have trebled
they could have trebled	I could have been trebling
you could have been trebling
he could have been trebling
we could have been trebling
you could have been trebling
they could have been trebling	

Negación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I couldn't treble
you couldn't treble
he couldn't treble
we couldn't treble
you couldn't treble
they couldn't treble 	I couldn't be trebling
you couldn't be trebling
he couldn't be trebling
we couldn't be trebling
you couldn't be trebling
they couldn't be trebling	I couldn't have trebled
you couldn't have trebled
he couldn't have trebled
we couldn't have trebled
you couldn't have trebled
they couldn't have trebled	I couldn't have been trebling
you couldn't have been trebling
he couldn't have been trebling
we couldn't have been trebling
you couldn't have been trebling
they couldn't have been trebling	

Forma interrogativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
could I treble?
could you treble?
could he treble?
could we treble?
could you treble?
could they treble? 	could I be trebling?
could you be trebling?
could he be trebling?
could we be trebling?
could you be trebling?
could they be trebling? 	could I have trebled?
could you have trebled?
could he have trebled?
could we have trebled?
could you have trebled?
could they have trebled? 	could I have been trebling?
could you have been trebling?
could he have been trebling?
could we have been trebling?
could you have been trebling?
could they have been trebling? 	

Forma interro-negativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
couldn't I treble?
couldn't you treble?
couldn't he treble?
couldn't we treble?
couldn't you treble?
couldn't they treble? 	couldn't I be trebling?
couldn't you be trebling?
couldn't he be trebling?
couldn't we be trebling?
couldn't you be trebling?
couldn't they be trebling? 	couldn't I have trebled?
couldn't you have trebled?
couldn't he have trebled?
couldn't we have trebled?
couldn't you have trebled?
couldn't they have trebled? 	couldn't I have been trebling?
couldn't you have been trebling?
couldn't he have been trebling?
couldn't we have been trebling?
couldn't you have been trebling?
couldn't they have been trebling?