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 must not clerk you must not clerk he must not clerk we must not clerk you must not clerk they must not clerk	I must not be clerking you must not be clerking he must not be clerking we must not be clerking you must not be clerking they must not be clerking
Perfect	V-ing perfect
I must not have clerked you must not have clerked he must not have clerked we must not have clerked you must not have clerked they must not have clerked	I must not have been clerking you must not have been clerking he must not have been clerking we must not have been clerking you must not have been clerking they must not 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
must I not clerk? must you not clerk? must he not clerk? must we not clerk? must you not clerk? must they not clerk?	must I not be clerking? must you not be clerking? must he not be clerking? must we not be clerking? must you not be clerking? must they not be clerking?
Perfect	V-ing perfect
must I not have clerked? must you not have clerked? must he not have clerked? must we not have clerked? must you not have clerked? must they not have clerked?	must I not have been clerking? must you not have been clerking? must he not have been clerking? must we not have been clerking? must you not have been clerking? must they not have been clerking?