English verb conjugation
MUST INTERFILE

Regular verb: interfile - interfiled - interfiled

Affirmation

Simple form	V-ing form
I must interfile you must interfile he must interfile we must interfile you must interfile they must interfile	I must be interfiling you must be interfiling he must be interfiling we must be interfiling you must be interfiling they must be interfiling
Perfect	V-ing perfect
I must have interfiled you must have interfiled he must have interfiled we must have interfiled you must have interfiled they must have interfiled	I must have been interfiling you must have been interfiling he must have been interfiling we must have been interfiling you must have been interfiling they must have been interfiling

Negation

Simple form	V-ing form
I mustn't interfile you mustn't interfile he mustn't interfile we mustn't interfile you mustn't interfile they mustn't interfile	I mustn't be interfiling you mustn't be interfiling he mustn't be interfiling we mustn't be interfiling you mustn't be interfiling they mustn't be interfiling
Perfect	V-ing perfect
I mustn't have interfiled you mustn't have interfiled he mustn't have interfiled we mustn't have interfiled you mustn't have interfiled they mustn't have interfiled	I mustn't have been interfiling you mustn't have been interfiling he mustn't have been interfiling we mustn't have been interfiling you mustn't have been interfiling they mustn't have been interfiling

Interrogative form

Simple form	V-ing form
must I interfile? must you interfile? must he interfile? must we interfile? must you interfile? must they interfile?	must I be interfiling? must you be interfiling? must he be interfiling? must we be interfiling? must you be interfiling? must they be interfiling?
Perfect	V-ing perfect
must I have interfiled? must you have interfiled? must he have interfiled? must we have interfiled? must you have interfiled? must they have interfiled?	must I have been interfiling? must you have been interfiling? must he have been interfiling? must we have been interfiling? must you have been interfiling? must they have been interfiling?

Interro-negative form

Simple form	V-ing form
mustn't I interfile? mustn't you interfile? mustn't he interfile? mustn't we interfile? mustn't you interfile? mustn't they interfile?	mustn't I be interfiling? mustn't you be interfiling? mustn't he be interfiling? mustn't we be interfiling? mustn't you be interfiling? mustn't they be interfiling?
Perfect	V-ing perfect
mustn't I have interfiled? mustn't you have interfiled? mustn't he have interfiled? mustn't we have interfiled? mustn't you have interfiled? mustn't they have interfiled?	mustn't I have been interfiling? mustn't you have been interfiling? mustn't he have been interfiling? mustn't we have been interfiling? mustn't you have been interfiling? mustn't they have been interfiling?