English verb conjugation COULD OPEN

Regular verb: open - opened - opened

Affirmation

Simple form

I could open
you could open
he could open
we could open
you could open
they could open

V-ing form

I could be opening
you could be opening
he could be opening
we could be opening
you could be opening
they could be opening

Perfect

I could have opened
you could have opened
he could have opened
we could have opened
you could have opened
they could have opened

V-ing perfect

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

Negation

Simple form

I could not open
you could not open
he could not open
we could not open
you could not open
they could not open

V-ing form

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

Perfect

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

V-ing perfect

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

Interrogative form

Simple form

could I open?
could you open?
could he open?
could we open?
could you open?
could they open?

V-ing form

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

Perfect

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

V-ing perfect

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

Interro-negative form

Simple form

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

V-ing form

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

Perfect

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

V-ing perfect

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

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