could preharden
Verbo regular: preharden - prehardened- prehardened

Afirmação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I could preharden
you could preharden
he could preharden
we could preharden
you could preharden
they could preharden 	I could be prehardening
you could be prehardening
he could be prehardening
we could be prehardening
you could be prehardening
they could be prehardening	I could have prehardened
you could have prehardened
he could have prehardened
we could have prehardened
you could have prehardened
they could have prehardened	I could have been prehardening
you could have been prehardening
he could have been prehardening
we could have been prehardening
you could have been prehardening
they could have been prehardening	

Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I could not preharden
you could not preharden
he could not preharden
we could not preharden
you could not preharden
they could not preharden 	I could not be prehardening
you could not be prehardening
he could not be prehardening
we could not be prehardening
you could not be prehardening
they could not be prehardening	I could not have prehardened
you could not have prehardened
he could not have prehardened
we could not have prehardened
you could not have prehardened
they could not have prehardened	I could not have been prehardening
you could not have been prehardening
he could not have been prehardening
we could not have been prehardening
you could not have been prehardening
they could not have been prehardening	

Forma interrogativa 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
could I preharden?
could you preharden?
could he preharden?
could we preharden?
could you preharden?
could they preharden? 	could I be prehardening?
could you be prehardening?
could he be prehardening?
could we be prehardening?
could you be prehardening?
could they be prehardening? 	could I have prehardened?
could you have prehardened?
could he have prehardened?
could we have prehardened?
could you have prehardened?
could they have prehardened? 	could I have been prehardening?
could you have been prehardening?
could he have been prehardening?
could we have been prehardening?
could you have been prehardening?
could they have been prehardening? 	

Forma interro-Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
could I not preharden?
could you not preharden?
could he not preharden?
could we not preharden?
could you not preharden?
could they not preharden? 	could I not be prehardening?
could you not be prehardening?
could he not be prehardening?
could we not be prehardening?
could you not be prehardening?
could they not be prehardening? 	could I not have prehardened?
could you not have prehardened?
could he not have prehardened?
could we not have prehardened?
could you not have prehardened?
could they not have prehardened? 	could I not have been prehardening?
could you not have been prehardening?
could he not have been prehardening?
could we not have been prehardening?
could you not have been prehardening?
could they not have been prehardening?