English verb conjugation
MUST TREK

Regular verb: trek - trekked - trekked

Affirmation

Simple form	V-ing form
I must trek you must trek she must trek we must trek you must trek they must trek	I must be trekking you must be trekking she must be trekking we must be trekking you must be trekking they must be trekking
Perfect	V-ing perfect
I must have trekked you must have trekked she must have trekked we must have trekked you must have trekked they must have trekked	I must have been trekking you must have been trekking she must have been trekking we must have been trekking you must have been trekking they must have been trekking

Negation

Simple form	V-ing form
I mustn't trek you mustn't trek she mustn't trek we mustn't trek you mustn't trek they mustn't trek	I mustn't be trekking you mustn't be trekking she mustn't be trekking we mustn't be trekking you mustn't be trekking they mustn't be trekking
Perfect	V-ing perfect
I mustn't have trekked you mustn't have trekked she mustn't have trekked we mustn't have trekked you mustn't have trekked they mustn't have trekked	I mustn't have been trekking you mustn't have been trekking she mustn't have been trekking we mustn't have been trekking you mustn't have been trekking they mustn't have been trekking

Interrogative form

Simple form	V-ing form
must I trek? must you trek? must she trek? must we trek? must you trek? must they trek?	must I be trekking? must you be trekking? must she be trekking? must we be trekking? must you be trekking? must they be trekking?
Perfect	V-ing perfect
must I have trekked? must you have trekked? must she have trekked? must we have trekked? must you have trekked? must they have trekked?	must I have been trekking? must you have been trekking? must she have been trekking? must we have been trekking? must you have been trekking? must they have been trekking?

Interro-negative form

Simple form	V-ing form
mustn't I trek? mustn't you trek? mustn't she trek? mustn't we trek? mustn't you trek? mustn't they trek?	mustn't I be trekking? mustn't you be trekking? mustn't she be trekking? mustn't we be trekking? mustn't you be trekking? mustn't they be trekking?
Perfect	V-ing perfect
mustn't I have trekked? mustn't you have trekked? mustn't she have trekked? mustn't we have trekked? mustn't you have trekked? mustn't they have trekked?	mustn't I have been trekking? mustn't you have been trekking? mustn't she have been trekking? mustn't we have been trekking? mustn't you have been trekking? mustn't they have been trekking?