must spearhead
Regular verb: spearhead - spearheaded- spearheaded

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must spearhead
you must spearhead
he must spearhead
we must spearhead
you must spearhead
they must spearhead 	I must be spearheading
you must be spearheading
he must be spearheading
we must be spearheading
you must be spearheading
they must be spearheading	I must have spearheaded
you must have spearheaded
he must have spearheaded
we must have spearheaded
you must have spearheaded
they must have spearheaded	I must have been spearheading
you must have been spearheading
he must have been spearheading
we must have been spearheading
you must have been spearheading
they must have been spearheading	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must not spearhead
you must not spearhead
he must not spearhead
we must not spearhead
you must not spearhead
they must not spearhead 	I must not be spearheading
you must not be spearheading
he must not be spearheading
we must not be spearheading
you must not be spearheading
they must not be spearheading	I must not have spearheaded
you must not have spearheaded
he must not have spearheaded
we must not have spearheaded
you must not have spearheaded
they must not have spearheaded	I must not have been spearheading
you must not have been spearheading
he must not have been spearheading
we must not have been spearheading
you must not have been spearheading
they must not have been spearheading	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I spearhead?
must you spearhead?
must he spearhead?
must we spearhead?
must you spearhead?
must they spearhead? 	must I be spearheading?
must you be spearheading?
must he be spearheading?
must we be spearheading?
must you be spearheading?
must they be spearheading? 	must I have spearheaded?
must you have spearheaded?
must he have spearheaded?
must we have spearheaded?
must you have spearheaded?
must they have spearheaded? 	must I have been spearheading?
must you have been spearheading?
must he have been spearheading?
must we have been spearheading?
must you have been spearheading?
must they have been spearheading? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I not spearhead?
must you not spearhead?
must he not spearhead?
must we not spearhead?
must you not spearhead?
must they not spearhead? 	must I not be spearheading?
must you not be spearheading?
must he not be spearheading?
must we not be spearheading?
must you not be spearheading?
must they not be spearheading? 	must I not have spearheaded?
must you not have spearheaded?
must he not have spearheaded?
must we not have spearheaded?
must you not have spearheaded?
must they not have spearheaded? 	must I not have been spearheading?
must you not have been spearheading?
must he not have been spearheading?
must we not have been spearheading?
must you not have been spearheading?
must they not have been spearheading?