English verb conjugation
MUST BEHAVE

Regular verb: behave - behaved - behaved

Affirmation

Simple form	V-ing form
I must behave you must behave he must behave we must behave you must behave they must behave	I must be behaving you must be behaving he must be behaving we must be behaving you must be behaving they must be behaving
Perfect	V-ing perfect
I must have behaved you must have behaved he must have behaved we must have behaved you must have behaved they must have behaved	I must have been behaving you must have been behaving he must have been behaving we must have been behaving you must have been behaving they must have been behaving

Negation

Simple form	V-ing form
I mustn't behave you mustn't behave he mustn't behave we mustn't behave you mustn't behave they mustn't behave	I mustn't be behaving you mustn't be behaving he mustn't be behaving we mustn't be behaving you mustn't be behaving they mustn't be behaving
Perfect	V-ing perfect
I mustn't have behaved you mustn't have behaved he mustn't have behaved we mustn't have behaved you mustn't have behaved they mustn't have behaved	I mustn't have been behaving you mustn't have been behaving he mustn't have been behaving we mustn't have been behaving you mustn't have been behaving they mustn't have been behaving

Interrogative form

Simple form	V-ing form
must I behave? must you behave? must he behave? must we behave? must you behave? must they behave?	must I be behaving? must you be behaving? must he be behaving? must we be behaving? must you be behaving? must they be behaving?
Perfect	V-ing perfect
must I have behaved? must you have behaved? must he have behaved? must we have behaved? must you have behaved? must they have behaved?	must I have been behaving? must you have been behaving? must he have been behaving? must we have been behaving? must you have been behaving? must they have been behaving?

Interro-negative form

Simple form	V-ing form
mustn't I behave? mustn't you behave? mustn't he behave? mustn't we behave? mustn't you behave? mustn't they behave?	mustn't I be behaving? mustn't you be behaving? mustn't he be behaving? mustn't we be behaving? mustn't you be behaving? mustn't they be behaving?
Perfect	V-ing perfect
mustn't I have behaved? mustn't you have behaved? mustn't he have behaved? mustn't we have behaved? mustn't you have behaved? mustn't they have behaved?	mustn't I have been behaving? mustn't you have been behaving? mustn't he have been behaving? mustn't we have been behaving? mustn't you have been behaving? mustn't they have been behaving?