must steepen
Verbo regular: steepen - steepened- steepened

Afirmación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I must steepen
you must steepen
he must steepen
we must steepen
you must steepen
they must steepen 	I must be steepening
you must be steepening
he must be steepening
we must be steepening
you must be steepening
they must be steepening	I must have steepened
you must have steepened
he must have steepened
we must have steepened
you must have steepened
they must have steepened	I must have been steepening
you must have been steepening
he must have been steepening
we must have been steepening
you must have been steepening
they must have been steepening	

Negación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I mustn't steepen
you mustn't steepen
he mustn't steepen
we mustn't steepen
you mustn't steepen
they mustn't steepen 	I mustn't be steepening
you mustn't be steepening
he mustn't be steepening
we mustn't be steepening
you mustn't be steepening
they mustn't be steepening	I mustn't have steepened
you mustn't have steepened
he mustn't have steepened
we mustn't have steepened
you mustn't have steepened
they mustn't have steepened	I mustn't have been steepening
you mustn't have been steepening
he mustn't have been steepening
we mustn't have been steepening
you mustn't have been steepening
they mustn't have been steepening	

Forma interrogativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
must I steepen?
must you steepen?
must he steepen?
must we steepen?
must you steepen?
must they steepen? 	must I be steepening?
must you be steepening?
must he be steepening?
must we be steepening?
must you be steepening?
must they be steepening? 	must I have steepened?
must you have steepened?
must he have steepened?
must we have steepened?
must you have steepened?
must they have steepened? 	must I have been steepening?
must you have been steepening?
must he have been steepening?
must we have been steepening?
must you have been steepening?
must they have been steepening? 	

Forma interro-negativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
mustn't I steepen?
mustn't you steepen?
mustn't he steepen?
mustn't we steepen?
mustn't you steepen?
mustn't they steepen? 	mustn't I be steepening?
mustn't you be steepening?
mustn't he be steepening?
mustn't we be steepening?
mustn't you be steepening?
mustn't they be steepening? 	mustn't I have steepened?
mustn't you have steepened?
mustn't he have steepened?
mustn't we have steepened?
mustn't you have steepened?
mustn't they have steepened? 	mustn't I have been steepening?
mustn't you have been steepening?
mustn't he have been steepening?
mustn't we have been steepening?
mustn't you have been steepening?
mustn't they have been steepening?