English verb conjugation
MUST BEHAVE

Regular verb: behave - behaved - behaved

Affirmation

Simple form	V-ing form
I must behave you must behave she must behave we must behave you must behave they must behave	I must be behaving you must be behaving she 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 she 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 she 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 she 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 she 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 she 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 she 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 she behave? must we behave? must you behave? must they behave?	must I be behaving? must you be behaving? must she 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 she 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 she 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 she 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 she 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 she 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 she have been behaving? mustn't we have been behaving? mustn't you have been behaving? mustn't they have been behaving?