Conjugación del verbo inglés
COULD THUMB

Verbo regular: thumb - thumbed - thumbed

Afirmación

Forma simple	Forma con V-ing
I could thumb you could thumb she could thumb we could thumb you could thumb they could thumb	I could be thumbing you could be thumbing she could be thumbing we could be thumbing you could be thumbing they could be thumbing
Perfecto	Perfecto con V-ing
I could have thumbed you could have thumbed she could have thumbed we could have thumbed you could have thumbed they could have thumbed	I could have been thumbing you could have been thumbing she could have been thumbing we could have been thumbing you could have been thumbing they could have been thumbing

Negación

Forma simple	Forma con V-ing
I could not thumb you could not thumb she could not thumb we could not thumb you could not thumb they could not thumb	I could not be thumbing you could not be thumbing she could not be thumbing we could not be thumbing you could not be thumbing they could not be thumbing
Perfecto	Perfecto con V-ing
I could not have thumbed you could not have thumbed she could not have thumbed we could not have thumbed you could not have thumbed they could not have thumbed	I could not have been thumbing you could not have been thumbing she could not have been thumbing we could not have been thumbing you could not have been thumbing they could not have been thumbing

Forma interrogativa

Forma simple	Forma con V-ing
could I thumb? could you thumb? could she thumb? could we thumb? could you thumb? could they thumb?	could I be thumbing? could you be thumbing? could she be thumbing? could we be thumbing? could you be thumbing? could they be thumbing?
Perfecto	Perfecto con V-ing
could I have thumbed? could you have thumbed? could she have thumbed? could we have thumbed? could you have thumbed? could they have thumbed?	could I have been thumbing? could you have been thumbing? could she have been thumbing? could we have been thumbing? could you have been thumbing? could they have been thumbing?

Forma interro-negativa

Forma simple	Forma con V-ing
could I not thumb? could you not thumb? could she not thumb? could we not thumb? could you not thumb? could they not thumb?	could I not be thumbing? could you not be thumbing? could she not be thumbing? could we not be thumbing? could you not be thumbing? could they not be thumbing?
Perfecto	Perfecto con V-ing
could I not have thumbed? could you not have thumbed? could she not have thumbed? could we not have thumbed? could you not have thumbed? could they not have thumbed?	could I not have been thumbing? could you not have been thumbing? could she not have been thumbing? could we not have been thumbing? could you not have been thumbing? could they not have been thumbing?