English verb conjugation
MUST BACKPACK

Regular verb: backpack - backpacked - backpacked

Affirmation

Simple form	V-ing form
I must backpack you must backpack she must backpack we must backpack you must backpack they must backpack	I must be backpacking you must be backpacking she must be backpacking we must be backpacking you must be backpacking they must be backpacking
Perfect	V-ing perfect
I must have backpacked you must have backpacked she must have backpacked we must have backpacked you must have backpacked they must have backpacked	I must have been backpacking you must have been backpacking she must have been backpacking we must have been backpacking you must have been backpacking they must have been backpacking

Negation

Simple form	V-ing form
I must not backpack you must not backpack she must not backpack we must not backpack you must not backpack they must not backpack	I must not be backpacking you must not be backpacking she must not be backpacking we must not be backpacking you must not be backpacking they must not be backpacking
Perfect	V-ing perfect
I must not have backpacked you must not have backpacked she must not have backpacked we must not have backpacked you must not have backpacked they must not have backpacked	I must not have been backpacking you must not have been backpacking she must not have been backpacking we must not have been backpacking you must not have been backpacking they must not have been backpacking

Interrogative form

Simple form	V-ing form
must I backpack? must you backpack? must she backpack? must we backpack? must you backpack? must they backpack?	must I be backpacking? must you be backpacking? must she be backpacking? must we be backpacking? must you be backpacking? must they be backpacking?
Perfect	V-ing perfect
must I have backpacked? must you have backpacked? must she have backpacked? must we have backpacked? must you have backpacked? must they have backpacked?	must I have been backpacking? must you have been backpacking? must she have been backpacking? must we have been backpacking? must you have been backpacking? must they have been backpacking?

Interro-negative form

Simple form	V-ing form
must I not backpack? must you not backpack? must she not backpack? must we not backpack? must you not backpack? must they not backpack?	must I not be backpacking? must you not be backpacking? must she not be backpacking? must we not be backpacking? must you not be backpacking? must they not be backpacking?
Perfect	V-ing perfect
must I not have backpacked? must you not have backpacked? must she not have backpacked? must we not have backpacked? must you not have backpacked? must they not have backpacked?	must I not have been backpacking? must you not have been backpacking? must she not have been backpacking? must we not have been backpacking? must you not have been backpacking? must they not have been backpacking?