must darken
Verbo regolare: darken - darkened- darkened

Affermazione 	
Forma semplice 	Forma con V-ing 	Perfetto 	Perfetto con V-ing 	
I must darken
you must darken
she must darken
we must darken
you must darken
they must darken 	I must be darkening
you must be darkening
she must be darkening
we must be darkening
you must be darkening
they must be darkening	I must have darkened
you must have darkened
she must have darkened
we must have darkened
you must have darkened
they must have darkened	I must have been darkening
you must have been darkening
she must have been darkening
we must have been darkening
you must have been darkening
they must have been darkening	

Negazione 	
Forma semplice 	Forma con V-ing 	Perfetto 	Perfetto con V-ing 	
I must not darken
you must not darken
she must not darken
we must not darken
you must not darken
they must not darken 	I must not be darkening
you must not be darkening
she must not be darkening
we must not be darkening
you must not be darkening
they must not be darkening	I must not have darkened
you must not have darkened
she must not have darkened
we must not have darkened
you must not have darkened
they must not have darkened	I must not have been darkening
you must not have been darkening
she must not have been darkening
we must not have been darkening
you must not have been darkening
they must not have been darkening	

Forma interrogativa 	
Forma semplice 	Forma con V-ing 	Perfetto 	Perfetto con V-ing 	
must I darken?
must you darken?
must she darken?
must we darken?
must you darken?
must they darken? 	must I be darkening?
must you be darkening?
must she be darkening?
must we be darkening?
must you be darkening?
must they be darkening? 	must I have darkened?
must you have darkened?
must she have darkened?
must we have darkened?
must you have darkened?
must they have darkened? 	must I have been darkening?
must you have been darkening?
must she have been darkening?
must we have been darkening?
must you have been darkening?
must they have been darkening? 	

Forma interro-negativa 	
Forma semplice 	Forma con V-ing 	Perfetto 	Perfetto con V-ing 	
must I not darken?
must you not darken?
must she not darken?
must we not darken?
must you not darken?
must they not darken? 	must I not be darkening?
must you not be darkening?
must she not be darkening?
must we not be darkening?
must you not be darkening?
must they not be darkening? 	must I not have darkened?
must you not have darkened?
must she not have darkened?
must we not have darkened?
must you not have darkened?
must they not have darkened? 	must I not have been darkening?
must you not have been darkening?
must she not have been darkening?
must we not have been darkening?
must you not have been darkening?
must they not have been darkening?