must trail
Regular verb: trail - trailed- trailed

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must trail
you must trail
he must trail
we must trail
you must trail
they must trail 	I must be trailing
you must be trailing
he must be trailing
we must be trailing
you must be trailing
they must be trailing	I must have trailed
you must have trailed
he must have trailed
we must have trailed
you must have trailed
they must have trailed	I must have been trailing
you must have been trailing
he must have been trailing
we must have been trailing
you must have been trailing
they must have been trailing	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must not trail
you must not trail
he must not trail
we must not trail
you must not trail
they must not trail 	I must not be trailing
you must not be trailing
he must not be trailing
we must not be trailing
you must not be trailing
they must not be trailing	I must not have trailed
you must not have trailed
he must not have trailed
we must not have trailed
you must not have trailed
they must not have trailed	I must not have been trailing
you must not have been trailing
he must not have been trailing
we must not have been trailing
you must not have been trailing
they must not have been trailing	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I trail?
must you trail?
must he trail?
must we trail?
must you trail?
must they trail? 	must I be trailing?
must you be trailing?
must he be trailing?
must we be trailing?
must you be trailing?
must they be trailing? 	must I have trailed?
must you have trailed?
must he have trailed?
must we have trailed?
must you have trailed?
must they have trailed? 	must I have been trailing?
must you have been trailing?
must he have been trailing?
must we have been trailing?
must you have been trailing?
must they have been trailing? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I not trail?
must you not trail?
must he not trail?
must we not trail?
must you not trail?
must they not trail? 	must I not be trailing?
must you not be trailing?
must he not be trailing?
must we not be trailing?
must you not be trailing?
must they not be trailing? 	must I not have trailed?
must you not have trailed?
must he not have trailed?
must we not have trailed?
must you not have trailed?
must they not have trailed? 	must I not have been trailing?
must you not have been trailing?
must he not have been trailing?
must we not have been trailing?
must you not have been trailing?
must they not have been trailing?