English verb conjugation
MUST TRAIL

Regular verb: trail - trailed - trailed

Affirmation

Simple form	V-ing form
I must trail you must trail she must trail we must trail you must trail they must trail	I must be trailing you must be trailing she 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 she 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 she 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 mustn't trail you mustn't trail she mustn't trail we mustn't trail you mustn't trail they mustn't trail	I mustn't be trailing you mustn't be trailing she mustn't be trailing we mustn't be trailing you mustn't be trailing they mustn't be trailing
Perfect	V-ing perfect
I mustn't have trailed you mustn't have trailed she mustn't have trailed we mustn't have trailed you mustn't have trailed they mustn't have trailed	I mustn't have been trailing you mustn't have been trailing she mustn't have been trailing we mustn't have been trailing you mustn't have been trailing they mustn't have been trailing

Interrogative form

Simple form	V-ing form
must I trail? must you trail? must she trail? must we trail? must you trail? must they trail?	must I be trailing? must you be trailing? must she 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 she 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 she 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
mustn't I trail? mustn't you trail? mustn't she trail? mustn't we trail? mustn't you trail? mustn't they trail?	mustn't I be trailing? mustn't you be trailing? mustn't she be trailing? mustn't we be trailing? mustn't you be trailing? mustn't they be trailing?
Perfect	V-ing perfect
mustn't I have trailed? mustn't you have trailed? mustn't she have trailed? mustn't we have trailed? mustn't you have trailed? mustn't they have trailed?	mustn't I have been trailing? mustn't you have been trailing? mustn't she have been trailing? mustn't we have been trailing? mustn't you have been trailing? mustn't they have been trailing?