English verb conjugation
MUST PREHARDEN

Regular verb: preharden - prehardened - prehardened

Affirmation

Simple form	V-ing form
I must preharden you must preharden she must preharden we must preharden you must preharden they must preharden	I must be prehardening you must be prehardening she must be prehardening we must be prehardening you must be prehardening they must be prehardening
Perfect	V-ing perfect
I must have prehardened you must have prehardened she must have prehardened we must have prehardened you must have prehardened they must have prehardened	I must have been prehardening you must have been prehardening she must have been prehardening we must have been prehardening you must have been prehardening they must have been prehardening

Negation

Simple form	V-ing form
I mustn't preharden you mustn't preharden she mustn't preharden we mustn't preharden you mustn't preharden they mustn't preharden	I mustn't be prehardening you mustn't be prehardening she mustn't be prehardening we mustn't be prehardening you mustn't be prehardening they mustn't be prehardening
Perfect	V-ing perfect
I mustn't have prehardened you mustn't have prehardened she mustn't have prehardened we mustn't have prehardened you mustn't have prehardened they mustn't have prehardened	I mustn't have been prehardening you mustn't have been prehardening she mustn't have been prehardening we mustn't have been prehardening you mustn't have been prehardening they mustn't have been prehardening

Interrogative form

Simple form	V-ing form
must I preharden? must you preharden? must she preharden? must we preharden? must you preharden? must they preharden?	must I be prehardening? must you be prehardening? must she be prehardening? must we be prehardening? must you be prehardening? must they be prehardening?
Perfect	V-ing perfect
must I have prehardened? must you have prehardened? must she have prehardened? must we have prehardened? must you have prehardened? must they have prehardened?	must I have been prehardening? must you have been prehardening? must she have been prehardening? must we have been prehardening? must you have been prehardening? must they have been prehardening?

Interro-negative form

Simple form	V-ing form
mustn't I preharden? mustn't you preharden? mustn't she preharden? mustn't we preharden? mustn't you preharden? mustn't they preharden?	mustn't I be prehardening? mustn't you be prehardening? mustn't she be prehardening? mustn't we be prehardening? mustn't you be prehardening? mustn't they be prehardening?
Perfect	V-ing perfect
mustn't I have prehardened? mustn't you have prehardened? mustn't she have prehardened? mustn't we have prehardened? mustn't you have prehardened? mustn't they have prehardened?	mustn't I have been prehardening? mustn't you have been prehardening? mustn't she have been prehardening? mustn't we have been prehardening? mustn't you have been prehardening? mustn't they have been prehardening?