English verb conjugation
MUST VACUUM

Regular verb: vacuum - vacuumed - vacuumed

Affirmation

Simple form	V-ing form
I must vacuum you must vacuum he must vacuum we must vacuum you must vacuum they must vacuum	I must be vacuuming you must be vacuuming he must be vacuuming we must be vacuuming you must be vacuuming they must be vacuuming
Perfect	V-ing perfect
I must have vacuumed you must have vacuumed he must have vacuumed we must have vacuumed you must have vacuumed they must have vacuumed	I must have been vacuuming you must have been vacuuming he must have been vacuuming we must have been vacuuming you must have been vacuuming they must have been vacuuming

Negation

Simple form	V-ing form
I must not vacuum you must not vacuum he must not vacuum we must not vacuum you must not vacuum they must not vacuum	I must not be vacuuming you must not be vacuuming he must not be vacuuming we must not be vacuuming you must not be vacuuming they must not be vacuuming
Perfect	V-ing perfect
I must not have vacuumed you must not have vacuumed he must not have vacuumed we must not have vacuumed you must not have vacuumed they must not have vacuumed	I must not have been vacuuming you must not have been vacuuming he must not have been vacuuming we must not have been vacuuming you must not have been vacuuming they must not have been vacuuming

Interrogative form

Simple form	V-ing form
must I vacuum? must you vacuum? must he vacuum? must we vacuum? must you vacuum? must they vacuum?	must I be vacuuming? must you be vacuuming? must he be vacuuming? must we be vacuuming? must you be vacuuming? must they be vacuuming?
Perfect	V-ing perfect
must I have vacuumed? must you have vacuumed? must he have vacuumed? must we have vacuumed? must you have vacuumed? must they have vacuumed?	must I have been vacuuming? must you have been vacuuming? must he have been vacuuming? must we have been vacuuming? must you have been vacuuming? must they have been vacuuming?

Interro-negative form

Simple form	V-ing form
must I not vacuum? must you not vacuum? must he not vacuum? must we not vacuum? must you not vacuum? must they not vacuum?	must I not be vacuuming? must you not be vacuuming? must he not be vacuuming? must we not be vacuuming? must you not be vacuuming? must they not be vacuuming?
Perfect	V-ing perfect
must I not have vacuumed? must you not have vacuumed? must he not have vacuumed? must we not have vacuumed? must you not have vacuumed? must they not have vacuumed?	must I not have been vacuuming? must you not have been vacuuming? must he not have been vacuuming? must we not have been vacuuming? must you not have been vacuuming? must they not have been vacuuming?