could treble
Verbo regular: treble - trebled- trebled

Afirmação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I could treble
you could treble
she could treble
we could treble
you could treble
they could treble 	I could be trebling
you could be trebling
she could be trebling
we could be trebling
you could be trebling
they could be trebling	I could have trebled
you could have trebled
she 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
she could have been trebling
we could have been trebling
you could have been trebling
they could have been trebling	

Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I could not treble
you could not treble
she could not treble
we could not treble
you could not treble
they could not treble 	I could not be trebling
you could not be trebling
she could not be trebling
we could not be trebling
you could not be trebling
they could not be trebling	I could not have trebled
you could not have trebled
she could not have trebled
we could not have trebled
you could not have trebled
they could not have trebled	I could not have been trebling
you could not have been trebling
she could not have been trebling
we could not have been trebling
you could not have been trebling
they could not have been trebling	

Forma interrogativa 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
could I treble?
could you treble?
could she treble?
could we treble?
could you treble?
could they treble? 	could I be trebling?
could you be trebling?
could she be trebling?
could we be trebling?
could you be trebling?
could they be trebling? 	could I have trebled?
could you have trebled?
could she 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 she have been trebling?
could we have been trebling?
could you have been trebling?
could they have been trebling? 	

Forma interro-Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
could I not treble?
could you not treble?
could she not treble?
could we not treble?
could you not treble?
could they not treble? 	could I not be trebling?
could you not be trebling?
could she not be trebling?
could we not be trebling?
could you not be trebling?
could they not be trebling? 	could I not have trebled?
could you not have trebled?
could she not have trebled?
could we not have trebled?
could you not have trebled?
could they not have trebled? 	could I not have been trebling?
could you not have been trebling?
could she not have been trebling?
could we not have been trebling?
could you not have been trebling?
could they not have been trebling?