English verb conjugation
MUST SCRUB

Regular verb: scrub - scrubbed - scrubbed

Affirmation

Simple form	V-ing form
I must scrub you must scrub he must scrub we must scrub you must scrub they must scrub	I must be scrubbing you must be scrubbing he must be scrubbing we must be scrubbing you must be scrubbing they must be scrubbing
Perfect	V-ing perfect
I must have scrubbed you must have scrubbed he must have scrubbed we must have scrubbed you must have scrubbed they must have scrubbed	I must have been scrubbing you must have been scrubbing he must have been scrubbing we must have been scrubbing you must have been scrubbing they must have been scrubbing

Negation

Simple form	V-ing form
I must not scrub you must not scrub he must not scrub we must not scrub you must not scrub they must not scrub	I must not be scrubbing you must not be scrubbing he must not be scrubbing we must not be scrubbing you must not be scrubbing they must not be scrubbing
Perfect	V-ing perfect
I must not have scrubbed you must not have scrubbed he must not have scrubbed we must not have scrubbed you must not have scrubbed they must not have scrubbed	I must not have been scrubbing you must not have been scrubbing he must not have been scrubbing we must not have been scrubbing you must not have been scrubbing they must not have been scrubbing

Interrogative form

Simple form	V-ing form
must I scrub? must you scrub? must he scrub? must we scrub? must you scrub? must they scrub?	must I be scrubbing? must you be scrubbing? must he be scrubbing? must we be scrubbing? must you be scrubbing? must they be scrubbing?
Perfect	V-ing perfect
must I have scrubbed? must you have scrubbed? must he have scrubbed? must we have scrubbed? must you have scrubbed? must they have scrubbed?	must I have been scrubbing? must you have been scrubbing? must he have been scrubbing? must we have been scrubbing? must you have been scrubbing? must they have been scrubbing?

Interro-negative form

Simple form	V-ing form
must I not scrub? must you not scrub? must he not scrub? must we not scrub? must you not scrub? must they not scrub?	must I not be scrubbing? must you not be scrubbing? must he not be scrubbing? must we not be scrubbing? must you not be scrubbing? must they not be scrubbing?
Perfect	V-ing perfect
must I not have scrubbed? must you not have scrubbed? must he not have scrubbed? must we not have scrubbed? must you not have scrubbed? must they not have scrubbed?	must I not have been scrubbing? must you not have been scrubbing? must he not have been scrubbing? must we not have been scrubbing? must you not have been scrubbing? must they not have been scrubbing?