must frustrate
Verbo regolare: frustrate - frustrated- frustrated

Affermazione 	
Forma semplice 	Forma con V-ing 	Perfetto 	Perfetto con V-ing 	
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	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	

Negazione 	
Forma semplice 	Forma con V-ing 	Perfetto 	Perfetto con V-ing 	
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	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	

Forma interrogativa 	
Forma semplice 	Forma con V-ing 	Perfetto 	Perfetto con V-ing 	
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? 	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? 	

Forma interro-negativa 	
Forma semplice 	Forma con V-ing 	Perfetto 	Perfetto con V-ing 	
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? 	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?