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 must not engage
you must not engage
she must not engage
we must not engage
you must not engage
they must not engage 	I must not be engaging
you must not be engaging
she must not be engaging
we must not be engaging
you must not be engaging
they must not be engaging	I must not have engaged
you must not have engaged
she must not have engaged
we must not have engaged
you must not have engaged
they must not have engaged	I must not have been engaging
you must not have been engaging
she must not have been engaging
we must not have been engaging
you must not have been engaging
they must not 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 	
must I not engage?
must you not engage?
must she not engage?
must we not engage?
must you not engage?
must they not engage? 	must I not be engaging?
must you not be engaging?
must she not be engaging?
must we not be engaging?
must you not be engaging?
must they not be engaging? 	must I not have engaged?
must you not have engaged?
must she not have engaged?
must we not have engaged?
must you not have engaged?
must they not have engaged? 	must I not have been engaging?
must you not have been engaging?
must she not have been engaging?
must we not have been engaging?
must you not have been engaging?
must they not have been engaging?