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 couldn't reharden
you couldn't reharden
he couldn't reharden
we couldn't reharden
you couldn't reharden
they couldn't reharden 	I couldn't be rehardening
you couldn't be rehardening
he couldn't be rehardening
we couldn't be rehardening
you couldn't be rehardening
they couldn't be rehardening	I couldn't have rehardened
you couldn't have rehardened
he couldn't have rehardened
we couldn't have rehardened
you couldn't have rehardened
they couldn't have rehardened	I couldn't have been rehardening
you couldn't have been rehardening
he couldn't have been rehardening
we couldn't have been rehardening
you couldn't have been rehardening
they couldn't 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 	
couldn't I reharden?
couldn't you reharden?
couldn't he reharden?
couldn't we reharden?
couldn't you reharden?
couldn't they reharden? 	couldn't I be rehardening?
couldn't you be rehardening?
couldn't he be rehardening?
couldn't we be rehardening?
couldn't you be rehardening?
couldn't they be rehardening? 	couldn't I have rehardened?
couldn't you have rehardened?
couldn't he have rehardened?
couldn't we have rehardened?
couldn't you have rehardened?
couldn't they have rehardened? 	couldn't I have been rehardening?
couldn't you have been rehardening?
couldn't he have been rehardening?
couldn't we have been rehardening?
couldn't you have been rehardening?
couldn't they have been rehardening?