could combust
Verbo regular: combust - combusted- combusted

Afirmação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I could combust
you could combust
he could combust
we could combust
you could combust
they could combust 	I could be combusting
you could be combusting
he could be combusting
we could be combusting
you could be combusting
they could be combusting	I could have combusted
you could have combusted
he could have combusted
we could have combusted
you could have combusted
they could have combusted	I could have been combusting
you could have been combusting
he could have been combusting
we could have been combusting
you could have been combusting
they could have been combusting	

Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I could not combust
you could not combust
he could not combust
we could not combust
you could not combust
they could not combust 	I could not be combusting
you could not be combusting
he could not be combusting
we could not be combusting
you could not be combusting
they could not be combusting	I could not have combusted
you could not have combusted
he could not have combusted
we could not have combusted
you could not have combusted
they could not have combusted	I could not have been combusting
you could not have been combusting
he could not have been combusting
we could not have been combusting
you could not have been combusting
they could not have been combusting	

Forma interrogativa 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
could I combust?
could you combust?
could he combust?
could we combust?
could you combust?
could they combust? 	could I be combusting?
could you be combusting?
could he be combusting?
could we be combusting?
could you be combusting?
could they be combusting? 	could I have combusted?
could you have combusted?
could he have combusted?
could we have combusted?
could you have combusted?
could they have combusted? 	could I have been combusting?
could you have been combusting?
could he have been combusting?
could we have been combusting?
could you have been combusting?
could they have been combusting? 	

Forma interro-Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
could I not combust?
could you not combust?
could he not combust?
could we not combust?
could you not combust?
could they not combust? 	could I not be combusting?
could you not be combusting?
could he not be combusting?
could we not be combusting?
could you not be combusting?
could they not be combusting? 	could I not have combusted?
could you not have combusted?
could he not have combusted?
could we not have combusted?
could you not have combusted?
could they not have combusted? 	could I not have been combusting?
could you not have been combusting?
could he not have been combusting?
could we not have been combusting?
could you not have been combusting?
could they not have been combusting?