English verb conjugation
MUST INTERFACE

Regular verb: interface - interfaced - interfaced

Affirmation

Simple form	V-ing form
I must interface you must interface he must interface we must interface you must interface they must interface	I must be interfacing you must be interfacing he must be interfacing we must be interfacing you must be interfacing they must be interfacing
Perfect	V-ing perfect
I must have interfaced you must have interfaced he must have interfaced we must have interfaced you must have interfaced they must have interfaced	I must have been interfacing you must have been interfacing he must have been interfacing we must have been interfacing you must have been interfacing they must have been interfacing

Negation

Simple form	V-ing form
I must not interface you must not interface he must not interface we must not interface you must not interface they must not interface	I must not be interfacing you must not be interfacing he must not be interfacing we must not be interfacing you must not be interfacing they must not be interfacing
Perfect	V-ing perfect
I must not have interfaced you must not have interfaced he must not have interfaced we must not have interfaced you must not have interfaced they must not have interfaced	I must not have been interfacing you must not have been interfacing he must not have been interfacing we must not have been interfacing you must not have been interfacing they must not have been interfacing

Interrogative form

Simple form	V-ing form
must I interface? must you interface? must he interface? must we interface? must you interface? must they interface?	must I be interfacing? must you be interfacing? must he be interfacing? must we be interfacing? must you be interfacing? must they be interfacing?
Perfect	V-ing perfect
must I have interfaced? must you have interfaced? must he have interfaced? must we have interfaced? must you have interfaced? must they have interfaced?	must I have been interfacing? must you have been interfacing? must he have been interfacing? must we have been interfacing? must you have been interfacing? must they have been interfacing?

Interro-negative form

Simple form	V-ing form
must I not interface? must you not interface? must he not interface? must we not interface? must you not interface? must they not interface?	must I not be interfacing? must you not be interfacing? must he not be interfacing? must we not be interfacing? must you not be interfacing? must they not be interfacing?
Perfect	V-ing perfect
must I not have interfaced? must you not have interfaced? must he not have interfaced? must we not have interfaced? must you not have interfaced? must they not have interfaced?	must I not have been interfacing? must you not have been interfacing? must he not have been interfacing? must we not have been interfacing? must you not have been interfacing? must they not have been interfacing?