English verb conjugation
MUST SPAN

Regular verb: span - spanned - spanned

Affirmation

Simple form	V-ing form
I must span you must span she must span we must span you must span they must span	I must be spanning you must be spanning she must be spanning we must be spanning you must be spanning they must be spanning
Perfect	V-ing perfect
I must have spanned you must have spanned she must have spanned we must have spanned you must have spanned they must have spanned	I must have been spanning you must have been spanning she must have been spanning we must have been spanning you must have been spanning they must have been spanning

Negation

Simple form	V-ing form
I must not span you must not span she must not span we must not span you must not span they must not span	I must not be spanning you must not be spanning she must not be spanning we must not be spanning you must not be spanning they must not be spanning
Perfect	V-ing perfect
I must not have spanned you must not have spanned she must not have spanned we must not have spanned you must not have spanned they must not have spanned	I must not have been spanning you must not have been spanning she must not have been spanning we must not have been spanning you must not have been spanning they must not have been spanning

Interrogative form

Simple form	V-ing form
must I span? must you span? must she span? must we span? must you span? must they span?	must I be spanning? must you be spanning? must she be spanning? must we be spanning? must you be spanning? must they be spanning?
Perfect	V-ing perfect
must I have spanned? must you have spanned? must she have spanned? must we have spanned? must you have spanned? must they have spanned?	must I have been spanning? must you have been spanning? must she have been spanning? must we have been spanning? must you have been spanning? must they have been spanning?

Interro-negative form

Simple form	V-ing form
must I not span? must you not span? must she not span? must we not span? must you not span? must they not span?	must I not be spanning? must you not be spanning? must she not be spanning? must we not be spanning? must you not be spanning? must they not be spanning?
Perfect	V-ing perfect
must I not have spanned? must you not have spanned? must she not have spanned? must we not have spanned? must you not have spanned? must they not have spanned?	must I not have been spanning? must you not have been spanning? must she not have been spanning? must we not have been spanning? must you not have been spanning? must they not have been spanning?