English verb conjugation
COULD INTER

Regular verb: inter - interred - interred

Affirmation

Simple form	V-ing form
I could inter you could inter he could inter we could inter you could inter they could inter	I could be interring you could be interring he could be interring we could be interring you could be interring they could be interring
Perfect	V-ing perfect
I could have interred you could have interred he could have interred we could have interred you could have interred they could have interred	I could have been interring you could have been interring he could have been interring we could have been interring you could have been interring they could have been interring

Negation

Simple form	V-ing form
I could not inter you could not inter he could not inter we could not inter you could not inter they could not inter	I could not be interring you could not be interring he could not be interring we could not be interring you could not be interring they could not be interring
Perfect	V-ing perfect
I could not have interred you could not have interred he could not have interred we could not have interred you could not have interred they could not have interred	I could not have been interring you could not have been interring he could not have been interring we could not have been interring you could not have been interring they could not have been interring

Interrogative form

Simple form	V-ing form
could I inter? could you inter? could he inter? could we inter? could you inter? could they inter?	could I be interring? could you be interring? could he be interring? could we be interring? could you be interring? could they be interring?
Perfect	V-ing perfect
could I have interred? could you have interred? could he have interred? could we have interred? could you have interred? could they have interred?	could I have been interring? could you have been interring? could he have been interring? could we have been interring? could you have been interring? could they have been interring?

Interro-negative form

Simple form	V-ing form
could I not inter? could you not inter? could he not inter? could we not inter? could you not inter? could they not inter?	could I not be interring? could you not be interring? could he not be interring? could we not be interring? could you not be interring? could they not be interring?
Perfect	V-ing perfect
could I not have interred? could you not have interred? could he not have interred? could we not have interred? could you not have interred? could they not have interred?	could I not have been interring? could you not have been interring? could he not have been interring? could we not have been interring? could you not have been interring? could they not have been interring?