English verb conjugation COULD THUMBTACK

Regular verb: thumbtack - thumbtacked - thumbtacked

Affirmation

Simple form

I could thumbtack
you could thumbtack
he could thumbtack
we could thumbtack
you could thumbtack
they could thumbtack

V-ing form

I could be thumbtacking
you could be thumbtacking
he could be thumbtacking
we could be thumbtacking
you could be thumbtacking
they could be thumbtacking

Perfect

I could have thumbtacked
you could have thumbtacked
he could have thumbtacked
we could have thumbtacked
you could have thumbtacked
they could have thumbtacked

V-ing perfect

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

Negation

Simple form

I could not thumbtack
you could not thumbtack
he could not thumbtack
we could not thumbtack
you could not thumbtack
they could not thumbtack

V-ing form

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

Perfect

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

V-ing perfect

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

Interrogative form

Simple form

could I thumbtack?
could you thumbtack?
could he thumbtack?
could we thumbtack?
could you thumbtack?
could they thumbtack?

V-ing form

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

Perfect

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

V-ing perfect

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

Interro-negative form

Simple form

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

V-ing form

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

Perfect

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

V-ing perfect

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

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