English verb conjugation
MUST EFFACE

Regular verb: efface - effaced - effaced

Affirmation

Simple form	V-ing form
I must efface you must efface she must efface we must efface you must efface they must efface	I must be effacing you must be effacing she must be effacing we must be effacing you must be effacing they must be effacing
Perfect	V-ing perfect
I must have effaced you must have effaced she must have effaced we must have effaced you must have effaced they must have effaced	I must have been effacing you must have been effacing she must have been effacing we must have been effacing you must have been effacing they must have been effacing

Negation

Simple form	V-ing form
I mustn't efface you mustn't efface she mustn't efface we mustn't efface you mustn't efface they mustn't efface	I mustn't be effacing you mustn't be effacing she mustn't be effacing we mustn't be effacing you mustn't be effacing they mustn't be effacing
Perfect	V-ing perfect
I mustn't have effaced you mustn't have effaced she mustn't have effaced we mustn't have effaced you mustn't have effaced they mustn't have effaced	I mustn't have been effacing you mustn't have been effacing she mustn't have been effacing we mustn't have been effacing you mustn't have been effacing they mustn't have been effacing

Interrogative form

Simple form	V-ing form
must I efface? must you efface? must she efface? must we efface? must you efface? must they efface?	must I be effacing? must you be effacing? must she be effacing? must we be effacing? must you be effacing? must they be effacing?
Perfect	V-ing perfect
must I have effaced? must you have effaced? must she have effaced? must we have effaced? must you have effaced? must they have effaced?	must I have been effacing? must you have been effacing? must she have been effacing? must we have been effacing? must you have been effacing? must they have been effacing?

Interro-negative form

Simple form	V-ing form
mustn't I efface? mustn't you efface? mustn't she efface? mustn't we efface? mustn't you efface? mustn't they efface?	mustn't I be effacing? mustn't you be effacing? mustn't she be effacing? mustn't we be effacing? mustn't you be effacing? mustn't they be effacing?
Perfect	V-ing perfect
mustn't I have effaced? mustn't you have effaced? mustn't she have effaced? mustn't we have effaced? mustn't you have effaced? mustn't they have effaced?	mustn't I have been effacing? mustn't you have been effacing? mustn't she have been effacing? mustn't we have been effacing? mustn't you have been effacing? mustn't they have been effacing?