must soften
Regular verb: soften - softened- softened

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must soften
you must soften
she must soften
we must soften
you must soften
they must soften 	I must be softening
you must be softening
she must be softening
we must be softening
you must be softening
they must be softening	I must have softened
you must have softened
she must have softened
we must have softened
you must have softened
they must have softened	I must have been softening
you must have been softening
she must have been softening
we must have been softening
you must have been softening
they must have been softening	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must not soften
you must not soften
she must not soften
we must not soften
you must not soften
they must not soften 	I must not be softening
you must not be softening
she must not be softening
we must not be softening
you must not be softening
they must not be softening	I must not have softened
you must not have softened
she must not have softened
we must not have softened
you must not have softened
they must not have softened	I must not have been softening
you must not have been softening
she must not have been softening
we must not have been softening
you must not have been softening
they must not have been softening	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I soften?
must you soften?
must she soften?
must we soften?
must you soften?
must they soften? 	must I be softening?
must you be softening?
must she be softening?
must we be softening?
must you be softening?
must they be softening? 	must I have softened?
must you have softened?
must she have softened?
must we have softened?
must you have softened?
must they have softened? 	must I have been softening?
must you have been softening?
must she have been softening?
must we have been softening?
must you have been softening?
must they have been softening? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I not soften?
must you not soften?
must she not soften?
must we not soften?
must you not soften?
must they not soften? 	must I not be softening?
must you not be softening?
must she not be softening?
must we not be softening?
must you not be softening?
must they not be softening? 	must I not have softened?
must you not have softened?
must she not have softened?
must we not have softened?
must you not have softened?
must they not have softened? 	must I not have been softening?
must you not have been softening?
must she not have been softening?
must we not have been softening?
must you not have been softening?
must they not have been softening?