could burn
Verbo regular: burn - burned- burned

Afirmação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I could burn
you could burn
he could burn
we could burn
you could burn
they could burn 	I could be burning
you could be burning
he could be burning
we could be burning
you could be burning
they could be burning	I could have burned
you could have burned
he could have burned
we could have burned
you could have burned
they could have burned	I could have been burning
you could have been burning
he could have been burning
we could have been burning
you could have been burning
they could have been burning	

Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I could not burn
you could not burn
he could not burn
we could not burn
you could not burn
they could not burn 	I could not be burning
you could not be burning
he could not be burning
we could not be burning
you could not be burning
they could not be burning	I could not have burned
you could not have burned
he could not have burned
we could not have burned
you could not have burned
they could not have burned	I could not have been burning
you could not have been burning
he could not have been burning
we could not have been burning
you could not have been burning
they could not have been burning	

Forma interrogativa 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
could I burn?
could you burn?
could he burn?
could we burn?
could you burn?
could they burn? 	could I be burning?
could you be burning?
could he be burning?
could we be burning?
could you be burning?
could they be burning? 	could I have burned?
could you have burned?
could he have burned?
could we have burned?
could you have burned?
could they have burned? 	could I have been burning?
could you have been burning?
could he have been burning?
could we have been burning?
could you have been burning?
could they have been burning? 	

Forma interro-Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
could I not burn?
could you not burn?
could he not burn?
could we not burn?
could you not burn?
could they not burn? 	could I not be burning?
could you not be burning?
could he not be burning?
could we not be burning?
could you not be burning?
could they not be burning? 	could I not have burned?
could you not have burned?
could he not have burned?
could we not have burned?
could you not have burned?
could they not have burned? 	could I not have been burning?
could you not have been burning?
could he not have been burning?
could we not have been burning?
could you not have been burning?
could they not have been burning?