could reharden
Regular verb: reharden - rehardened- rehardened

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could reharden
you could reharden
he could reharden
we could reharden
you could reharden
they could reharden 	I could be rehardening
you could be rehardening
he could be rehardening
we could be rehardening
you could be rehardening
they could be rehardening	I could have rehardened
you could have rehardened
he could have rehardened
we could have rehardened
you could have rehardened
they could have rehardened	I could have been rehardening
you could have been rehardening
he could have been rehardening
we could have been rehardening
you could have been rehardening
they could have been rehardening	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could not reharden
you could not reharden
he could not reharden
we could not reharden
you could not reharden
they could not reharden 	I could not be rehardening
you could not be rehardening
he could not be rehardening
we could not be rehardening
you could not be rehardening
they could not be rehardening	I could not have rehardened
you could not have rehardened
he could not have rehardened
we could not have rehardened
you could not have rehardened
they could not have rehardened	I could not have been rehardening
you could not have been rehardening
he could not have been rehardening
we could not have been rehardening
you could not have been rehardening
they could not have been rehardening	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I reharden?
could you reharden?
could he reharden?
could we reharden?
could you reharden?
could they reharden? 	could I be rehardening?
could you be rehardening?
could he be rehardening?
could we be rehardening?
could you be rehardening?
could they be rehardening? 	could I have rehardened?
could you have rehardened?
could he have rehardened?
could we have rehardened?
could you have rehardened?
could they have rehardened? 	could I have been rehardening?
could you have been rehardening?
could he have been rehardening?
could we have been rehardening?
could you have been rehardening?
could they have been rehardening? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I not reharden?
could you not reharden?
could he not reharden?
could we not reharden?
could you not reharden?
could they not reharden? 	could I not be rehardening?
could you not be rehardening?
could he not be rehardening?
could we not be rehardening?
could you not be rehardening?
could they not be rehardening? 	could I not have rehardened?
could you not have rehardened?
could he not have rehardened?
could we not have rehardened?
could you not have rehardened?
could they not have rehardened? 	could I not have been rehardening?
could you not have been rehardening?
could he not have been rehardening?
could we not have been rehardening?
could you not have been rehardening?
could they not have been rehardening?