Conjugación del verbo inglés
COULD MARK

Verbo regular: mark - marked - marked

Afirmación

Forma simple	Forma con V-ing
I could mark you could mark he could mark we could mark you could mark they could mark	I could be marking you could be marking he could be marking we could be marking you could be marking they could be marking
Perfecto	Perfecto con V-ing
I could have marked you could have marked he could have marked we could have marked you could have marked they could have marked	I could have been marking you could have been marking he could have been marking we could have been marking you could have been marking they could have been marking

Negación

Forma simple	Forma con V-ing
I could not mark you could not mark he could not mark we could not mark you could not mark they could not mark	I could not be marking you could not be marking he could not be marking we could not be marking you could not be marking they could not be marking
Perfecto	Perfecto con V-ing
I could not have marked you could not have marked he could not have marked we could not have marked you could not have marked they could not have marked	I could not have been marking you could not have been marking he could not have been marking we could not have been marking you could not have been marking they could not have been marking

Forma interrogativa

Forma simple	Forma con V-ing
could I mark? could you mark? could he mark? could we mark? could you mark? could they mark?	could I be marking? could you be marking? could he be marking? could we be marking? could you be marking? could they be marking?
Perfecto	Perfecto con V-ing
could I have marked? could you have marked? could he have marked? could we have marked? could you have marked? could they have marked?	could I have been marking? could you have been marking? could he have been marking? could we have been marking? could you have been marking? could they have been marking?

Forma interro-negativa

Forma simple	Forma con V-ing
could I not mark? could you not mark? could he not mark? could we not mark? could you not mark? could they not mark?	could I not be marking? could you not be marking? could he not be marking? could we not be marking? could you not be marking? could they not be marking?
Perfecto	Perfecto con V-ing
could I not have marked? could you not have marked? could he not have marked? could we not have marked? could you not have marked? could they not have marked?	could I not have been marking? could you not have been marking? could he not have been marking? could we not have been marking? could you not have been marking? could they not have been marking?