English verb conjugation COULD THUMB

Regular verb: thumb - thumbed - thumbed

Affirmation

Simple form

I could thumb
you could thumb
he could thumb
we could thumb
you could thumb
they could thumb

V-ing form

I could be thumbing
you could be thumbing
he could be thumbing
we could be thumbing
you could be thumbing
they could be thumbing

Perfect

I could have thumbed
you could have thumbed
he could have thumbed
we could have thumbed
you could have thumbed
they could have thumbed

V-ing perfect

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

Negation

Simple form

I couldn't thumb
you couldn't thumb
he couldn't thumb
we couldn't thumb
you couldn't thumb
they couldn't thumb

V-ing form

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

Perfect

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

V-ing perfect

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

Interrogative form

Simple form

could I thumb?
could you thumb?
could he thumb?
could we thumb?
could you thumb?
could they thumb?

V-ing form

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

Perfect

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

V-ing perfect

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

Interro-negative form

Simple form

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

V-ing form

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

Perfect

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

V-ing perfect

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

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