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 mustn't preexist you mustn't preexist he mustn't preexist we mustn't preexist you mustn't preexist they mustn't preexist	I mustn't be preexisting you mustn't be preexisting he mustn't be preexisting we mustn't be preexisting you mustn't be preexisting they mustn't be preexisting
Perfect	V-ing perfect
I mustn't have preexisted you mustn't have preexisted he mustn't have preexisted we mustn't have preexisted you mustn't have preexisted they mustn't have preexisted	I mustn't have been preexisting you mustn't have been preexisting he mustn't have been preexisting we mustn't have been preexisting you mustn't have been preexisting they mustn't 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
mustn't I preexist? mustn't you preexist? mustn't he preexist? mustn't we preexist? mustn't you preexist? mustn't they preexist?	mustn't I be preexisting? mustn't you be preexisting? mustn't he be preexisting? mustn't we be preexisting? mustn't you be preexisting? mustn't they be preexisting?
Perfect	V-ing perfect
mustn't I have preexisted? mustn't you have preexisted? mustn't he have preexisted? mustn't we have preexisted? mustn't you have preexisted? mustn't they have preexisted?	mustn't I have been preexisting? mustn't you have been preexisting? mustn't he have been preexisting? mustn't we have been preexisting? mustn't you have been preexisting? mustn't they have been preexisting?