English verb conjugation
MUST TRAIL

Regular verb: trail - trailed - trailed

Affirmation

Simple form	V-ing form
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
Perfect	V-ing perfect
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
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
Perfect	V-ing perfect
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
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?
Perfect	V-ing perfect
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
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?
Perfect	V-ing perfect
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?