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 couldn't thumbtack
you couldn't thumbtack
he couldn't thumbtack
we couldn't thumbtack
you couldn't thumbtack
they couldn't thumbtack

V-ing form

I couldn't be thumbtacking
you couldn't be thumbtacking
he couldn't be thumbtacking
we couldn't be thumbtacking
you couldn't be thumbtacking
they couldn't be thumbtacking

Perfect

I couldn't have thumbtacked
you couldn't have thumbtacked
he couldn't have thumbtacked
we couldn't have thumbtacked
you couldn't have thumbtacked
they couldn't have thumbtacked

V-ing perfect

I couldn't have been thumbtacking
you couldn't have been thumbtacking
he couldn't have been thumbtacking
we couldn't have been thumbtacking
you couldn't have been thumbtacking
they couldn't 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

couldn't I thumbtack?
couldn't you thumbtack?
couldn't he thumbtack?
couldn't we thumbtack?
couldn't you thumbtack?
couldn't they thumbtack?

V-ing form

couldn't I be thumbtacking?
couldn't you be thumbtacking?
couldn't he be thumbtacking?
couldn't we be thumbtacking?
couldn't you be thumbtacking?
couldn't they be thumbtacking?

Perfect

couldn't I have thumbtacked?
couldn't you have thumbtacked?
couldn't he have thumbtacked?
couldn't we have thumbtacked?
couldn't you have thumbtacked?
couldn't they have thumbtacked?

V-ing perfect

couldn't I have been thumbtacking?
couldn't you have been thumbtacking?
couldn't he have been thumbtacking?
couldn't we have been thumbtacking?
couldn't you have been thumbtacking?
couldn't they have been thumbtacking?

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