English verb conjugation
MUST WHITEN

Regular verb: whiten - whitened - whitened

Affirmation

Simple form	V-ing form
I must whiten you must whiten she must whiten we must whiten you must whiten they must whiten	I must be whitening you must be whitening she must be whitening we must be whitening you must be whitening they must be whitening
Perfect	V-ing perfect
I must have whitened you must have whitened she must have whitened we must have whitened you must have whitened they must have whitened	I must have been whitening you must have been whitening she must have been whitening we must have been whitening you must have been whitening they must have been whitening

Negation

Simple form	V-ing form
I mustn't whiten you mustn't whiten she mustn't whiten we mustn't whiten you mustn't whiten they mustn't whiten	I mustn't be whitening you mustn't be whitening she mustn't be whitening we mustn't be whitening you mustn't be whitening they mustn't be whitening
Perfect	V-ing perfect
I mustn't have whitened you mustn't have whitened she mustn't have whitened we mustn't have whitened you mustn't have whitened they mustn't have whitened	I mustn't have been whitening you mustn't have been whitening she mustn't have been whitening we mustn't have been whitening you mustn't have been whitening they mustn't have been whitening

Interrogative form

Simple form	V-ing form
must I whiten? must you whiten? must she whiten? must we whiten? must you whiten? must they whiten?	must I be whitening? must you be whitening? must she be whitening? must we be whitening? must you be whitening? must they be whitening?
Perfect	V-ing perfect
must I have whitened? must you have whitened? must she have whitened? must we have whitened? must you have whitened? must they have whitened?	must I have been whitening? must you have been whitening? must she have been whitening? must we have been whitening? must you have been whitening? must they have been whitening?

Interro-negative form

Simple form	V-ing form
mustn't I whiten? mustn't you whiten? mustn't she whiten? mustn't we whiten? mustn't you whiten? mustn't they whiten?	mustn't I be whitening? mustn't you be whitening? mustn't she be whitening? mustn't we be whitening? mustn't you be whitening? mustn't they be whitening?
Perfect	V-ing perfect
mustn't I have whitened? mustn't you have whitened? mustn't she have whitened? mustn't we have whitened? mustn't you have whitened? mustn't they have whitened?	mustn't I have been whitening? mustn't you have been whitening? mustn't she have been whitening? mustn't we have been whitening? mustn't you have been whitening? mustn't they have been whitening?