can steepen
Regular verb: steepen - steepened- steepened

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

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

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

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