English verb conjugation COULD ERR

Regular verb: err - erred - erred

Affirmation

Simple form

I could err
you could err
he could err
we could err
you could err
they could err

V-ing form

I could be erring
you could be erring
he could be erring
we could be erring
you could be erring
they could be erring

Perfect

I could have erred
you could have erred
he could have erred
we could have erred
you could have erred
they could have erred

V-ing perfect

I could have been erring
you could have been erring
he could have been erring
we could have been erring
you could have been erring
they could have been erring

Negation

Simple form

I could not err
you could not err
he could not err
we could not err
you could not err
they could not err

V-ing form

I could not be erring
you could not be erring
he could not be erring
we could not be erring
you could not be erring
they could not be erring

Perfect

I could not have erred
you could not have erred
he could not have erred
we could not have erred
you could not have erred
they could not have erred

V-ing perfect

I could not have been erring
you could not have been erring
he could not have been erring
we could not have been erring
you could not have been erring
they could not have been erring

Interrogative form

Simple form

could I err?
could you err?
could he err?
could we err?
could you err?
could they err?

V-ing form

could I be erring?
could you be erring?
could he be erring?
could we be erring?
could you be erring?
could they be erring?

Perfect

could I have erred?
could you have erred?
could he have erred?
could we have erred?
could you have erred?
could they have erred?

V-ing perfect

could I have been erring?
could you have been erring?
could he have been erring?
could we have been erring?
could you have been erring?
could they have been erring?

Interro-negative form

Simple form

could I not err?
could you not err?
could he not err?
could we not err?
could you not err?
could they not err?

V-ing form

could I not be erring?
could you not be erring?
could he not be erring?
could we not be erring?
could you not be erring?
could they not be erring?

Perfect

could I not have erred?
could you not have erred?
could he not have erred?
could we not have erred?
could you not have erred?
could they not have erred?

V-ing perfect

could I not have been erring?
could you not have been erring?
could he not have been erring?
could we not have been erring?
could you not have been erring?
could they not have been erring?

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