English verb conjugation
MUST SWEETEN

Regular verb: sweeten - sweetened - sweetened

Affirmation

Simple form	V-ing form
I must sweeten you must sweeten he must sweeten we must sweeten you must sweeten they must sweeten	I must be sweetening you must be sweetening he must be sweetening we must be sweetening you must be sweetening they must be sweetening
Perfect	V-ing perfect
I must have sweetened you must have sweetened he must have sweetened we must have sweetened you must have sweetened they must have sweetened	I must have been sweetening you must have been sweetening he must have been sweetening we must have been sweetening you must have been sweetening they must have been sweetening

Negation

Simple form	V-ing form
I mustn't sweeten you mustn't sweeten he mustn't sweeten we mustn't sweeten you mustn't sweeten they mustn't sweeten	I mustn't be sweetening you mustn't be sweetening he mustn't be sweetening we mustn't be sweetening you mustn't be sweetening they mustn't be sweetening
Perfect	V-ing perfect
I mustn't have sweetened you mustn't have sweetened he mustn't have sweetened we mustn't have sweetened you mustn't have sweetened they mustn't have sweetened	I mustn't have been sweetening you mustn't have been sweetening he mustn't have been sweetening we mustn't have been sweetening you mustn't have been sweetening they mustn't have been sweetening

Interrogative form

Simple form	V-ing form
must I sweeten? must you sweeten? must he sweeten? must we sweeten? must you sweeten? must they sweeten?	must I be sweetening? must you be sweetening? must he be sweetening? must we be sweetening? must you be sweetening? must they be sweetening?
Perfect	V-ing perfect
must I have sweetened? must you have sweetened? must he have sweetened? must we have sweetened? must you have sweetened? must they have sweetened?	must I have been sweetening? must you have been sweetening? must he have been sweetening? must we have been sweetening? must you have been sweetening? must they have been sweetening?

Interro-negative form

Simple form	V-ing form
mustn't I sweeten? mustn't you sweeten? mustn't he sweeten? mustn't we sweeten? mustn't you sweeten? mustn't they sweeten?	mustn't I be sweetening? mustn't you be sweetening? mustn't he be sweetening? mustn't we be sweetening? mustn't you be sweetening? mustn't they be sweetening?
Perfect	V-ing perfect
mustn't I have sweetened? mustn't you have sweetened? mustn't he have sweetened? mustn't we have sweetened? mustn't you have sweetened? mustn't they have sweetened?	mustn't I have been sweetening? mustn't you have been sweetening? mustn't he have been sweetening? mustn't we have been sweetening? mustn't you have been sweetening? mustn't they have been sweetening?