I must interfile you must interfile he must interfile we must interfile you must interfile they must interfile
V-ing form
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
I must have interfiled you must have interfiled he must have interfiled we must have interfiled you must have interfiled they must have interfiled
V-ing perfect
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
I must not interfile you must not interfile he must not interfile we must not interfile you must not interfile they must not interfile
V-ing form
I must not be interfiling you must not be interfiling he must not be interfiling we must not be interfiling you must not be interfiling they must not be interfiling
Perfect
I must not have interfiled you must not have interfiled he must not have interfiled we must not have interfiled you must not have interfiled they must not have interfiled
V-ing perfect
I must not have been interfiling you must not have been interfiling he must not have been interfiling we must not have been interfiling you must not have been interfiling they must not have been interfiling
Interrogative form
Simple form
must I interfile? must you interfile? must he interfile? must we interfile? must you interfile? must they interfile?
V-ing form
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
must I have interfiled? must you have interfiled? must he have interfiled? must we have interfiled? must you have interfiled? must they have interfiled?
V-ing perfect
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
must I not interfile? must you not interfile? must he not interfile? must we not interfile? must you not interfile? must they not interfile?
V-ing form
must I not be interfiling? must you not be interfiling? must he not be interfiling? must we not be interfiling? must you not be interfiling? must they not be interfiling?
Perfect
must I not have interfiled? must you not have interfiled? must he not have interfiled? must we not have interfiled? must you not have interfiled? must they not have interfiled?
V-ing perfect
must I not have been interfiling? must you not have been interfiling? must he not have been interfiling? must we not have been interfiling? must you not have been interfiling? must they not have been interfiling?