could steepen
Regular verb: steepen - steepened- steepened

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could steepen
you could steepen
he could steepen
we could steepen
you could steepen
they could steepen 	I could be steepening
you could be steepening
he could be steepening
we could be steepening
you could be steepening
they could be steepening	I could have steepened
you could have steepened
he could have steepened
we could have steepened
you could have steepened
they could have steepened	I could have been steepening
you could have been steepening
he could have been steepening
we could have been steepening
you could have been steepening
they could have been steepening	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I couldn't steepen
you couldn't steepen
he couldn't steepen
we couldn't steepen
you couldn't steepen
they couldn't steepen 	I couldn't be steepening
you couldn't be steepening
he couldn't be steepening
we couldn't be steepening
you couldn't be steepening
they couldn't be steepening	I couldn't have steepened
you couldn't have steepened
he couldn't have steepened
we couldn't have steepened
you couldn't have steepened
they couldn't have steepened	I couldn't have been steepening
you couldn't have been steepening
he couldn't have been steepening
we couldn't have been steepening
you couldn't have been steepening
they couldn't have been steepening	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I steepen?
could you steepen?
could he steepen?
could we steepen?
could you steepen?
could they steepen? 	could I be steepening?
could you be steepening?
could he be steepening?
could we be steepening?
could you be steepening?
could they be steepening? 	could I have steepened?
could you have steepened?
could he have steepened?
could we have steepened?
could you have steepened?
could they have steepened? 	could I have been steepening?
could you have been steepening?
could he have been steepening?
could we have been steepening?
could you have been steepening?
could they have been steepening? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
couldn't I steepen?
couldn't you steepen?
couldn't he steepen?
couldn't we steepen?
couldn't you steepen?
couldn't they steepen? 	couldn't I be steepening?
couldn't you be steepening?
couldn't he be steepening?
couldn't we be steepening?
couldn't you be steepening?
couldn't they be steepening? 	couldn't I have steepened?
couldn't you have steepened?
couldn't he have steepened?
couldn't we have steepened?
couldn't you have steepened?
couldn't they have steepened? 	couldn't I have been steepening?
couldn't you have been steepening?
couldn't he have been steepening?
couldn't we have been steepening?
couldn't you have been steepening?
couldn't they have been steepening?