English verb conjugation
COULD FRUSTRATE

Regular verb: frustrate - frustrated - frustrated

Affirmation

Simple form	V-ing form
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
Perfect	V-ing perfect
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

Negation

Simple form	V-ing form
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
Perfect	V-ing perfect
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

Interrogative form

Simple form	V-ing form
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?
Perfect	V-ing perfect
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?

Interro-negative form

Simple form	V-ing form
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?
Perfect	V-ing perfect
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?