English verb conjugation
MUST INTERFACE

Regular verb: interface - interfaced - interfaced

Affirmation

Simple form	V-ing form
I must interface you must interface she must interface we must interface you must interface they must interface	I must be interfacing you must be interfacing she 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 she 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 she 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 mustn't interface you mustn't interface she mustn't interface we mustn't interface you mustn't interface they mustn't interface	I mustn't be interfacing you mustn't be interfacing she mustn't be interfacing we mustn't be interfacing you mustn't be interfacing they mustn't be interfacing
Perfect	V-ing perfect
I mustn't have interfaced you mustn't have interfaced she mustn't have interfaced we mustn't have interfaced you mustn't have interfaced they mustn't have interfaced	I mustn't have been interfacing you mustn't have been interfacing she mustn't have been interfacing we mustn't have been interfacing you mustn't have been interfacing they mustn't have been interfacing

Interrogative form

Simple form	V-ing form
must I interface? must you interface? must she interface? must we interface? must you interface? must they interface?	must I be interfacing? must you be interfacing? must she 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 she 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 she 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
mustn't I interface? mustn't you interface? mustn't she interface? mustn't we interface? mustn't you interface? mustn't they interface?	mustn't I be interfacing? mustn't you be interfacing? mustn't she be interfacing? mustn't we be interfacing? mustn't you be interfacing? mustn't they be interfacing?
Perfect	V-ing perfect
mustn't I have interfaced? mustn't you have interfaced? mustn't she have interfaced? mustn't we have interfaced? mustn't you have interfaced? mustn't they have interfaced?	mustn't I have been interfacing? mustn't you have been interfacing? mustn't she have been interfacing? mustn't we have been interfacing? mustn't you have been interfacing? mustn't they have been interfacing?