English verb conjugation
MUST LEAVEN

Regular verb: leaven - leavened - leavened

Affirmation

Simple form	V-ing form
I must leaven you must leaven he must leaven we must leaven you must leaven they must leaven	I must be leavening you must be leavening he must be leavening we must be leavening you must be leavening they must be leavening
Perfect	V-ing perfect
I must have leavened you must have leavened he must have leavened we must have leavened you must have leavened they must have leavened	I must have been leavening you must have been leavening he must have been leavening we must have been leavening you must have been leavening they must have been leavening

Negation

Simple form	V-ing form
I mustn't leaven you mustn't leaven he mustn't leaven we mustn't leaven you mustn't leaven they mustn't leaven	I mustn't be leavening you mustn't be leavening he mustn't be leavening we mustn't be leavening you mustn't be leavening they mustn't be leavening
Perfect	V-ing perfect
I mustn't have leavened you mustn't have leavened he mustn't have leavened we mustn't have leavened you mustn't have leavened they mustn't have leavened	I mustn't have been leavening you mustn't have been leavening he mustn't have been leavening we mustn't have been leavening you mustn't have been leavening they mustn't have been leavening

Interrogative form

Simple form	V-ing form
must I leaven? must you leaven? must he leaven? must we leaven? must you leaven? must they leaven?	must I be leavening? must you be leavening? must he be leavening? must we be leavening? must you be leavening? must they be leavening?
Perfect	V-ing perfect
must I have leavened? must you have leavened? must he have leavened? must we have leavened? must you have leavened? must they have leavened?	must I have been leavening? must you have been leavening? must he have been leavening? must we have been leavening? must you have been leavening? must they have been leavening?

Interro-negative form

Simple form	V-ing form
mustn't I leaven? mustn't you leaven? mustn't he leaven? mustn't we leaven? mustn't you leaven? mustn't they leaven?	mustn't I be leavening? mustn't you be leavening? mustn't he be leavening? mustn't we be leavening? mustn't you be leavening? mustn't they be leavening?
Perfect	V-ing perfect
mustn't I have leavened? mustn't you have leavened? mustn't he have leavened? mustn't we have leavened? mustn't you have leavened? mustn't they have leavened?	mustn't I have been leavening? mustn't you have been leavening? mustn't he have been leavening? mustn't we have been leavening? mustn't you have been leavening? mustn't they have been leavening?