must engage
Regular verb: engage - engaged- engaged

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must engage
you must engage
she must engage
we must engage
you must engage
they must engage 	I must be engaging
you must be engaging
she must be engaging
we must be engaging
you must be engaging
they must be engaging	I must have engaged
you must have engaged
she must have engaged
we must have engaged
you must have engaged
they must have engaged	I must have been engaging
you must have been engaging
she must have been engaging
we must have been engaging
you must have been engaging
they must have been engaging	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I mustn't engage
you mustn't engage
she mustn't engage
we mustn't engage
you mustn't engage
they mustn't engage 	I mustn't be engaging
you mustn't be engaging
she mustn't be engaging
we mustn't be engaging
you mustn't be engaging
they mustn't be engaging	I mustn't have engaged
you mustn't have engaged
she mustn't have engaged
we mustn't have engaged
you mustn't have engaged
they mustn't have engaged	I mustn't have been engaging
you mustn't have been engaging
she mustn't have been engaging
we mustn't have been engaging
you mustn't have been engaging
they mustn't have been engaging	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I engage?
must you engage?
must she engage?
must we engage?
must you engage?
must they engage? 	must I be engaging?
must you be engaging?
must she be engaging?
must we be engaging?
must you be engaging?
must they be engaging? 	must I have engaged?
must you have engaged?
must she have engaged?
must we have engaged?
must you have engaged?
must they have engaged? 	must I have been engaging?
must you have been engaging?
must she have been engaging?
must we have been engaging?
must you have been engaging?
must they have been engaging? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
mustn't I engage?
mustn't you engage?
mustn't she engage?
mustn't we engage?
mustn't you engage?
mustn't they engage? 	mustn't I be engaging?
mustn't you be engaging?
mustn't she be engaging?
mustn't we be engaging?
mustn't you be engaging?
mustn't they be engaging? 	mustn't I have engaged?
mustn't you have engaged?
mustn't she have engaged?
mustn't we have engaged?
mustn't you have engaged?
mustn't they have engaged? 	mustn't I have been engaging?
mustn't you have been engaging?
mustn't she have been engaging?
mustn't we have been engaging?
mustn't you have been engaging?
mustn't they have been engaging?