English verb conjugation
MUST HELM

Regular verb: helm - helmed - helmed

Affirmation

Simple form	V-ing form
I must helm you must helm she must helm we must helm you must helm they must helm	I must be helming you must be helming she must be helming we must be helming you must be helming they must be helming
Perfect	V-ing perfect
I must have helmed you must have helmed she must have helmed we must have helmed you must have helmed they must have helmed	I must have been helming you must have been helming she must have been helming we must have been helming you must have been helming they must have been helming

Negation

Simple form	V-ing form
I must not helm you must not helm she must not helm we must not helm you must not helm they must not helm	I must not be helming you must not be helming she must not be helming we must not be helming you must not be helming they must not be helming
Perfect	V-ing perfect
I must not have helmed you must not have helmed she must not have helmed we must not have helmed you must not have helmed they must not have helmed	I must not have been helming you must not have been helming she must not have been helming we must not have been helming you must not have been helming they must not have been helming

Interrogative form

Simple form	V-ing form
must I helm? must you helm? must she helm? must we helm? must you helm? must they helm?	must I be helming? must you be helming? must she be helming? must we be helming? must you be helming? must they be helming?
Perfect	V-ing perfect
must I have helmed? must you have helmed? must she have helmed? must we have helmed? must you have helmed? must they have helmed?	must I have been helming? must you have been helming? must she have been helming? must we have been helming? must you have been helming? must they have been helming?

Interro-negative form

Simple form	V-ing form
must I not helm? must you not helm? must she not helm? must we not helm? must you not helm? must they not helm?	must I not be helming? must you not be helming? must she not be helming? must we not be helming? must you not be helming? must they not be helming?
Perfect	V-ing perfect
must I not have helmed? must you not have helmed? must she not have helmed? must we not have helmed? must you not have helmed? must they not have helmed?	must I not have been helming? must you not have been helming? must she not have been helming? must we not have been helming? must you not have been helming? must they not have been helming?