could preboil
Verbo regular: preboil - preboiled- preboiled

Afirmação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I could preboil
you could preboil
he could preboil
we could preboil
you could preboil
they could preboil 	I could be preboiling
you could be preboiling
he could be preboiling
we could be preboiling
you could be preboiling
they could be preboiling	I could have preboiled
you could have preboiled
he could have preboiled
we could have preboiled
you could have preboiled
they could have preboiled	I could have been preboiling
you could have been preboiling
he could have been preboiling
we could have been preboiling
you could have been preboiling
they could have been preboiling	

Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I could not preboil
you could not preboil
he could not preboil
we could not preboil
you could not preboil
they could not preboil 	I could not be preboiling
you could not be preboiling
he could not be preboiling
we could not be preboiling
you could not be preboiling
they could not be preboiling	I could not have preboiled
you could not have preboiled
he could not have preboiled
we could not have preboiled
you could not have preboiled
they could not have preboiled	I could not have been preboiling
you could not have been preboiling
he could not have been preboiling
we could not have been preboiling
you could not have been preboiling
they could not have been preboiling	

Forma interrogativa 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
could I preboil?
could you preboil?
could he preboil?
could we preboil?
could you preboil?
could they preboil? 	could I be preboiling?
could you be preboiling?
could he be preboiling?
could we be preboiling?
could you be preboiling?
could they be preboiling? 	could I have preboiled?
could you have preboiled?
could he have preboiled?
could we have preboiled?
could you have preboiled?
could they have preboiled? 	could I have been preboiling?
could you have been preboiling?
could he have been preboiling?
could we have been preboiling?
could you have been preboiling?
could they have been preboiling? 	

Forma interro-Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
could I not preboil?
could you not preboil?
could he not preboil?
could we not preboil?
could you not preboil?
could they not preboil? 	could I not be preboiling?
could you not be preboiling?
could he not be preboiling?
could we not be preboiling?
could you not be preboiling?
could they not be preboiling? 	could I not have preboiled?
could you not have preboiled?
could he not have preboiled?
could we not have preboiled?
could you not have preboiled?
could they not have preboiled? 	could I not have been preboiling?
could you not have been preboiling?
could he not have been preboiling?
could we not have been preboiling?
could you not have been preboiling?
could they not have been preboiling?