English verb conjugation
MUST CRISPEN

Regular verb: crispen - crispened - crispened

Affirmation

Simple form	V-ing form
I must crispen you must crispen he must crispen we must crispen you must crispen they must crispen	I must be crispening you must be crispening he must be crispening we must be crispening you must be crispening they must be crispening
Perfect	V-ing perfect
I must have crispened you must have crispened he must have crispened we must have crispened you must have crispened they must have crispened	I must have been crispening you must have been crispening he must have been crispening we must have been crispening you must have been crispening they must have been crispening

Negation

Simple form	V-ing form
I mustn't crispen you mustn't crispen he mustn't crispen we mustn't crispen you mustn't crispen they mustn't crispen	I mustn't be crispening you mustn't be crispening he mustn't be crispening we mustn't be crispening you mustn't be crispening they mustn't be crispening
Perfect	V-ing perfect
I mustn't have crispened you mustn't have crispened he mustn't have crispened we mustn't have crispened you mustn't have crispened they mustn't have crispened	I mustn't have been crispening you mustn't have been crispening he mustn't have been crispening we mustn't have been crispening you mustn't have been crispening they mustn't have been crispening

Interrogative form

Simple form	V-ing form
must I crispen? must you crispen? must he crispen? must we crispen? must you crispen? must they crispen?	must I be crispening? must you be crispening? must he be crispening? must we be crispening? must you be crispening? must they be crispening?
Perfect	V-ing perfect
must I have crispened? must you have crispened? must he have crispened? must we have crispened? must you have crispened? must they have crispened?	must I have been crispening? must you have been crispening? must he have been crispening? must we have been crispening? must you have been crispening? must they have been crispening?

Interro-negative form

Simple form	V-ing form
mustn't I crispen? mustn't you crispen? mustn't he crispen? mustn't we crispen? mustn't you crispen? mustn't they crispen?	mustn't I be crispening? mustn't you be crispening? mustn't he be crispening? mustn't we be crispening? mustn't you be crispening? mustn't they be crispening?
Perfect	V-ing perfect
mustn't I have crispened? mustn't you have crispened? mustn't he have crispened? mustn't we have crispened? mustn't you have crispened? mustn't they have crispened?	mustn't I have been crispening? mustn't you have been crispening? mustn't he have been crispening? mustn't we have been crispening? mustn't you have been crispening? mustn't they have been crispening?