English verb conjugation
COULD INTERFILE

Regular verb: interfile - interfiled - interfiled

Affirmation

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

Negation

Simple form	V-ing form
I could not interfile you could not interfile she could not interfile we could not interfile you could not interfile they could not interfile	I could not be interfiling you could not be interfiling she could not be interfiling we could not be interfiling you could not be interfiling they could not be interfiling
Perfect	V-ing perfect
I could not have interfiled you could not have interfiled she could not have interfiled we could not have interfiled you could not have interfiled they could not have interfiled	I could not have been interfiling you could not have been interfiling she could not have been interfiling we could not have been interfiling you could not have been interfiling they could not have been interfiling

Interrogative form

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

Interro-negative form

Simple form	V-ing form
could I not interfile? could you not interfile? could she not interfile? could we not interfile? could you not interfile? could they not interfile?	could I not be interfiling? could you not be interfiling? could she not be interfiling? could we not be interfiling? could you not be interfiling? could they not be interfiling?
Perfect	V-ing perfect
could I not have interfiled? could you not have interfiled? could she not have interfiled? could we not have interfiled? could you not have interfiled? could they not have interfiled?	could I not have been interfiling? could you not have been interfiling? could she not have been interfiling? could we not have been interfiling? could you not have been interfiling? could they not have been interfiling?