English verb conjugation
MUST FRUSTRATE

Regular verb: frustrate - frustrated - frustrated

Affirmation

Simple form	V-ing form
I must frustrate you must frustrate he must frustrate we must frustrate you must frustrate they must frustrate	I must be frustrating you must be frustrating he must be frustrating we must be frustrating you must be frustrating they must be frustrating
Perfect	V-ing perfect
I must have frustrated you must have frustrated he must have frustrated we must have frustrated you must have frustrated they must have frustrated	I must have been frustrating you must have been frustrating he must have been frustrating we must have been frustrating you must have been frustrating they must have been frustrating

Negation

Simple form	V-ing form
I mustn't frustrate you mustn't frustrate he mustn't frustrate we mustn't frustrate you mustn't frustrate they mustn't frustrate	I mustn't be frustrating you mustn't be frustrating he mustn't be frustrating we mustn't be frustrating you mustn't be frustrating they mustn't be frustrating
Perfect	V-ing perfect
I mustn't have frustrated you mustn't have frustrated he mustn't have frustrated we mustn't have frustrated you mustn't have frustrated they mustn't have frustrated	I mustn't have been frustrating you mustn't have been frustrating he mustn't have been frustrating we mustn't have been frustrating you mustn't have been frustrating they mustn't have been frustrating

Interrogative form

Simple form	V-ing form
must I frustrate? must you frustrate? must he frustrate? must we frustrate? must you frustrate? must they frustrate?	must I be frustrating? must you be frustrating? must he be frustrating? must we be frustrating? must you be frustrating? must they be frustrating?
Perfect	V-ing perfect
must I have frustrated? must you have frustrated? must he have frustrated? must we have frustrated? must you have frustrated? must they have frustrated?	must I have been frustrating? must you have been frustrating? must he have been frustrating? must we have been frustrating? must you have been frustrating? must they have been frustrating?

Interro-negative form

Simple form	V-ing form
mustn't I frustrate? mustn't you frustrate? mustn't he frustrate? mustn't we frustrate? mustn't you frustrate? mustn't they frustrate?	mustn't I be frustrating? mustn't you be frustrating? mustn't he be frustrating? mustn't we be frustrating? mustn't you be frustrating? mustn't they be frustrating?
Perfect	V-ing perfect
mustn't I have frustrated? mustn't you have frustrated? mustn't he have frustrated? mustn't we have frustrated? mustn't you have frustrated? mustn't they have frustrated?	mustn't I have been frustrating? mustn't you have been frustrating? mustn't he have been frustrating? mustn't we have been frustrating? mustn't you have been frustrating? mustn't they have been frustrating?