English verb conjugation
MUST ATTACH

Regular verb: attach - attached - attached

Affirmation

Simple form	V-ing form
I must attach you must attach he must attach we must attach you must attach they must attach	I must be attaching you must be attaching he must be attaching we must be attaching you must be attaching they must be attaching
Perfect	V-ing perfect
I must have attached you must have attached he must have attached we must have attached you must have attached they must have attached	I must have been attaching you must have been attaching he must have been attaching we must have been attaching you must have been attaching they must have been attaching

Negation

Simple form	V-ing form
I mustn't attach you mustn't attach he mustn't attach we mustn't attach you mustn't attach they mustn't attach	I mustn't be attaching you mustn't be attaching he mustn't be attaching we mustn't be attaching you mustn't be attaching they mustn't be attaching
Perfect	V-ing perfect
I mustn't have attached you mustn't have attached he mustn't have attached we mustn't have attached you mustn't have attached they mustn't have attached	I mustn't have been attaching you mustn't have been attaching he mustn't have been attaching we mustn't have been attaching you mustn't have been attaching they mustn't have been attaching

Interrogative form

Simple form	V-ing form
must I attach? must you attach? must he attach? must we attach? must you attach? must they attach?	must I be attaching? must you be attaching? must he be attaching? must we be attaching? must you be attaching? must they be attaching?
Perfect	V-ing perfect
must I have attached? must you have attached? must he have attached? must we have attached? must you have attached? must they have attached?	must I have been attaching? must you have been attaching? must he have been attaching? must we have been attaching? must you have been attaching? must they have been attaching?

Interro-negative form

Simple form	V-ing form
mustn't I attach? mustn't you attach? mustn't he attach? mustn't we attach? mustn't you attach? mustn't they attach?	mustn't I be attaching? mustn't you be attaching? mustn't he be attaching? mustn't we be attaching? mustn't you be attaching? mustn't they be attaching?
Perfect	V-ing perfect
mustn't I have attached? mustn't you have attached? mustn't he have attached? mustn't we have attached? mustn't you have attached? mustn't they have attached?	mustn't I have been attaching? mustn't you have been attaching? mustn't he have been attaching? mustn't we have been attaching? mustn't you have been attaching? mustn't they have been attaching?