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
she could burn
we could burn
you could burn
they could burn 	I could be burning
you could be burning
she could be burning
we could be burning
you could be burning
they could be burning	I could have burned
you could have burned
she 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
she 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 couldn't burn
you couldn't burn
she couldn't burn
we couldn't burn
you couldn't burn
they couldn't burn 	I couldn't be burning
you couldn't be burning
she couldn't be burning
we couldn't be burning
you couldn't be burning
they couldn't be burning	I couldn't have burned
you couldn't have burned
she couldn't have burned
we couldn't have burned
you couldn't have burned
they couldn't have burned	I couldn't have been burning
you couldn't have been burning
she couldn't have been burning
we couldn't have been burning
you couldn't have been burning
they couldn't have been burning	

Forma interrogativa 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
could I burn?
could you burn?
could she burn?
could we burn?
could you burn?
could they burn? 	could I be burning?
could you be burning?
could she be burning?
could we be burning?
could you be burning?
could they be burning? 	could I have burned?
could you have burned?
could she 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 she 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 	
couldn't I burn?
couldn't you burn?
couldn't she burn?
couldn't we burn?
couldn't you burn?
couldn't they burn? 	couldn't I be burning?
couldn't you be burning?
couldn't she be burning?
couldn't we be burning?
couldn't you be burning?
couldn't they be burning? 	couldn't I have burned?
couldn't you have burned?
couldn't she have burned?
couldn't we have burned?
couldn't you have burned?
couldn't they have burned? 	couldn't I have been burning?
couldn't you have been burning?
couldn't she have been burning?
couldn't we have been burning?
couldn't you have been burning?
couldn't they have been burning?