could frustrate
Verbo regolare: frustrate - frustrated- frustrated

Affermazione 	
Forma semplice 	Forma con V-ing 	Perfetto 	Perfetto con V-ing 	
I could frustrate
you could frustrate
he could frustrate
we could frustrate
you could frustrate
they could frustrate 	I could be frustrating
you could be frustrating
he could be frustrating
we could be frustrating
you could be frustrating
they could be frustrating	I could have frustrated
you could have frustrated
he could have frustrated
we could have frustrated
you could have frustrated
they could have frustrated	I could have been frustrating
you could have been frustrating
he could have been frustrating
we could have been frustrating
you could have been frustrating
they could have been frustrating	

Negazione 	
Forma semplice 	Forma con V-ing 	Perfetto 	Perfetto con V-ing 	
I couldn't frustrate
you couldn't frustrate
he couldn't frustrate
we couldn't frustrate
you couldn't frustrate
they couldn't frustrate 	I couldn't be frustrating
you couldn't be frustrating
he couldn't be frustrating
we couldn't be frustrating
you couldn't be frustrating
they couldn't be frustrating	I couldn't have frustrated
you couldn't have frustrated
he couldn't have frustrated
we couldn't have frustrated
you couldn't have frustrated
they couldn't have frustrated	I couldn't have been frustrating
you couldn't have been frustrating
he couldn't have been frustrating
we couldn't have been frustrating
you couldn't have been frustrating
they couldn't have been frustrating	

Forma interrogativa 	
Forma semplice 	Forma con V-ing 	Perfetto 	Perfetto con V-ing 	
could I frustrate?
could you frustrate?
could he frustrate?
could we frustrate?
could you frustrate?
could they frustrate? 	could I be frustrating?
could you be frustrating?
could he be frustrating?
could we be frustrating?
could you be frustrating?
could they be frustrating? 	could I have frustrated?
could you have frustrated?
could he have frustrated?
could we have frustrated?
could you have frustrated?
could they have frustrated? 	could I have been frustrating?
could you have been frustrating?
could he have been frustrating?
could we have been frustrating?
could you have been frustrating?
could they have been frustrating? 	

Forma interro-negativa 	
Forma semplice 	Forma con V-ing 	Perfetto 	Perfetto con V-ing 	
couldn't I frustrate?
couldn't you frustrate?
couldn't he frustrate?
couldn't we frustrate?
couldn't you frustrate?
couldn't they frustrate? 	couldn't I be frustrating?
couldn't you be frustrating?
couldn't he be frustrating?
couldn't we be frustrating?
couldn't you be frustrating?
couldn't they be frustrating? 	couldn't I have frustrated?
couldn't you have frustrated?
couldn't he have frustrated?
couldn't we have frustrated?
couldn't you have frustrated?
couldn't they have frustrated? 	couldn't I have been frustrating?
couldn't you have been frustrating?
couldn't he have been frustrating?
couldn't we have been frustrating?
couldn't you have been frustrating?
couldn't they have been frustrating?