English verb conjugation
MUST PREEXIST

Regular verb: preexist - preexisted - preexisted

Affirmation

Simple form	V-ing form
I must preexist you must preexist he must preexist we must preexist you must preexist they must preexist	I must be preexisting you must be preexisting he must be preexisting we must be preexisting you must be preexisting they must be preexisting
Perfect	V-ing perfect
I must have preexisted you must have preexisted he must have preexisted we must have preexisted you must have preexisted they must have preexisted	I must have been preexisting you must have been preexisting he must have been preexisting we must have been preexisting you must have been preexisting they must have been preexisting

Negation

Simple form	V-ing form
I must not preexist you must not preexist he must not preexist we must not preexist you must not preexist they must not preexist	I must not be preexisting you must not be preexisting he must not be preexisting we must not be preexisting you must not be preexisting they must not be preexisting
Perfect	V-ing perfect
I must not have preexisted you must not have preexisted he must not have preexisted we must not have preexisted you must not have preexisted they must not have preexisted	I must not have been preexisting you must not have been preexisting he must not have been preexisting we must not have been preexisting you must not have been preexisting they must not have been preexisting

Interrogative form

Simple form	V-ing form
must I preexist? must you preexist? must he preexist? must we preexist? must you preexist? must they preexist?	must I be preexisting? must you be preexisting? must he be preexisting? must we be preexisting? must you be preexisting? must they be preexisting?
Perfect	V-ing perfect
must I have preexisted? must you have preexisted? must he have preexisted? must we have preexisted? must you have preexisted? must they have preexisted?	must I have been preexisting? must you have been preexisting? must he have been preexisting? must we have been preexisting? must you have been preexisting? must they have been preexisting?

Interro-negative form

Simple form	V-ing form
must I not preexist? must you not preexist? must he not preexist? must we not preexist? must you not preexist? must they not preexist?	must I not be preexisting? must you not be preexisting? must he not be preexisting? must we not be preexisting? must you not be preexisting? must they not be preexisting?
Perfect	V-ing perfect
must I not have preexisted? must you not have preexisted? must he not have preexisted? must we not have preexisted? must you not have preexisted? must they not have preexisted?	must I not have been preexisting? must you not have been preexisting? must he not have been preexisting? must we not have been preexisting? must you not have been preexisting? must they not have been preexisting?