English verb conjugation
MUST CLERK

Regular verb: clerk - clerked - clerked

Affirmation

Simple form	V-ing form
I must clerk you must clerk he must clerk we must clerk you must clerk they must clerk	I must be clerking you must be clerking he must be clerking we must be clerking you must be clerking they must be clerking
Perfect	V-ing perfect
I must have clerked you must have clerked he must have clerked we must have clerked you must have clerked they must have clerked	I must have been clerking you must have been clerking he must have been clerking we must have been clerking you must have been clerking they must have been clerking

Negation

Simple form	V-ing form
I mustn't clerk you mustn't clerk he mustn't clerk we mustn't clerk you mustn't clerk they mustn't clerk	I mustn't be clerking you mustn't be clerking he mustn't be clerking we mustn't be clerking you mustn't be clerking they mustn't be clerking
Perfect	V-ing perfect
I mustn't have clerked you mustn't have clerked he mustn't have clerked we mustn't have clerked you mustn't have clerked they mustn't have clerked	I mustn't have been clerking you mustn't have been clerking he mustn't have been clerking we mustn't have been clerking you mustn't have been clerking they mustn't have been clerking

Interrogative form

Simple form	V-ing form
must I clerk? must you clerk? must he clerk? must we clerk? must you clerk? must they clerk?	must I be clerking? must you be clerking? must he be clerking? must we be clerking? must you be clerking? must they be clerking?
Perfect	V-ing perfect
must I have clerked? must you have clerked? must he have clerked? must we have clerked? must you have clerked? must they have clerked?	must I have been clerking? must you have been clerking? must he have been clerking? must we have been clerking? must you have been clerking? must they have been clerking?

Interro-negative form

Simple form	V-ing form
mustn't I clerk? mustn't you clerk? mustn't he clerk? mustn't we clerk? mustn't you clerk? mustn't they clerk?	mustn't I be clerking? mustn't you be clerking? mustn't he be clerking? mustn't we be clerking? mustn't you be clerking? mustn't they be clerking?
Perfect	V-ing perfect
mustn't I have clerked? mustn't you have clerked? mustn't he have clerked? mustn't we have clerked? mustn't you have clerked? mustn't they have clerked?	mustn't I have been clerking? mustn't you have been clerking? mustn't he have been clerking? mustn't we have been clerking? mustn't you have been clerking? mustn't they have been clerking?