must ahead
Regular verb: ahead - aheaded- aheaded

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must ahead
you must ahead
he must ahead
we must ahead
you must ahead
they must ahead 	I must be aheading
you must be aheading
he must be aheading
we must be aheading
you must be aheading
they must be aheading	I must have aheaded
you must have aheaded
he must have aheaded
we must have aheaded
you must have aheaded
they must have aheaded	I must have been aheading
you must have been aheading
he must have been aheading
we must have been aheading
you must have been aheading
they must have been aheading	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must not ahead
you must not ahead
he must not ahead
we must not ahead
you must not ahead
they must not ahead 	I must not be aheading
you must not be aheading
he must not be aheading
we must not be aheading
you must not be aheading
they must not be aheading	I must not have aheaded
you must not have aheaded
he must not have aheaded
we must not have aheaded
you must not have aheaded
they must not have aheaded	I must not have been aheading
you must not have been aheading
he must not have been aheading
we must not have been aheading
you must not have been aheading
they must not have been aheading	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I ahead?
must you ahead?
must he ahead?
must we ahead?
must you ahead?
must they ahead? 	must I be aheading?
must you be aheading?
must he be aheading?
must we be aheading?
must you be aheading?
must they be aheading? 	must I have aheaded?
must you have aheaded?
must he have aheaded?
must we have aheaded?
must you have aheaded?
must they have aheaded? 	must I have been aheading?
must you have been aheading?
must he have been aheading?
must we have been aheading?
must you have been aheading?
must they have been aheading? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I not ahead?
must you not ahead?
must he not ahead?
must we not ahead?
must you not ahead?
must they not ahead? 	must I not be aheading?
must you not be aheading?
must he not be aheading?
must we not be aheading?
must you not be aheading?
must they not be aheading? 	must I not have aheaded?
must you not have aheaded?
must he not have aheaded?
must we not have aheaded?
must you not have aheaded?
must they not have aheaded? 	must I not have been aheading?
must you not have been aheading?
must he not have been aheading?
must we not have been aheading?
must you not have been aheading?
must they not have been aheading?