English verb conjugation
MUST KIBITZ

Regular verb: kibitz - kibitzed - kibitzed

Affirmation

Simple form	V-ing form
I must kibitz you must kibitz he must kibitz we must kibitz you must kibitz they must kibitz	I must be kibitzing you must be kibitzing he must be kibitzing we must be kibitzing you must be kibitzing they must be kibitzing
Perfect	V-ing perfect
I must have kibitzed you must have kibitzed he must have kibitzed we must have kibitzed you must have kibitzed they must have kibitzed	I must have been kibitzing you must have been kibitzing he must have been kibitzing we must have been kibitzing you must have been kibitzing they must have been kibitzing

Negation

Simple form	V-ing form
I mustn't kibitz you mustn't kibitz he mustn't kibitz we mustn't kibitz you mustn't kibitz they mustn't kibitz	I mustn't be kibitzing you mustn't be kibitzing he mustn't be kibitzing we mustn't be kibitzing you mustn't be kibitzing they mustn't be kibitzing
Perfect	V-ing perfect
I mustn't have kibitzed you mustn't have kibitzed he mustn't have kibitzed we mustn't have kibitzed you mustn't have kibitzed they mustn't have kibitzed	I mustn't have been kibitzing you mustn't have been kibitzing he mustn't have been kibitzing we mustn't have been kibitzing you mustn't have been kibitzing they mustn't have been kibitzing

Interrogative form

Simple form	V-ing form
must I kibitz? must you kibitz? must he kibitz? must we kibitz? must you kibitz? must they kibitz?	must I be kibitzing? must you be kibitzing? must he be kibitzing? must we be kibitzing? must you be kibitzing? must they be kibitzing?
Perfect	V-ing perfect
must I have kibitzed? must you have kibitzed? must he have kibitzed? must we have kibitzed? must you have kibitzed? must they have kibitzed?	must I have been kibitzing? must you have been kibitzing? must he have been kibitzing? must we have been kibitzing? must you have been kibitzing? must they have been kibitzing?

Interro-negative form

Simple form	V-ing form
mustn't I kibitz? mustn't you kibitz? mustn't he kibitz? mustn't we kibitz? mustn't you kibitz? mustn't they kibitz?	mustn't I be kibitzing? mustn't you be kibitzing? mustn't he be kibitzing? mustn't we be kibitzing? mustn't you be kibitzing? mustn't they be kibitzing?
Perfect	V-ing perfect
mustn't I have kibitzed? mustn't you have kibitzed? mustn't he have kibitzed? mustn't we have kibitzed? mustn't you have kibitzed? mustn't they have kibitzed?	mustn't I have been kibitzing? mustn't you have been kibitzing? mustn't he have been kibitzing? mustn't we have been kibitzing? mustn't you have been kibitzing? mustn't they have been kibitzing?