I could tug you could tug she could tug we could tug you could tug they could tug
Forma con V-ing
I could be tugging you could be tugging she could be tugging we could be tugging you could be tugging they could be tugging
Perfecto
I could have tugged you could have tugged she could have tugged we could have tugged you could have tugged they could have tugged
Perfecto con V-ing
I could have been tugging you could have been tugging she could have been tugging we could have been tugging you could have been tugging they could have been tugging
Negación
Forma simple
I could not tug you could not tug she could not tug we could not tug you could not tug they could not tug
Forma con V-ing
I could not be tugging you could not be tugging she could not be tugging we could not be tugging you could not be tugging they could not be tugging
Perfecto
I could not have tugged you could not have tugged she could not have tugged we could not have tugged you could not have tugged they could not have tugged
Perfecto con V-ing
I could not have been tugging you could not have been tugging she could not have been tugging we could not have been tugging you could not have been tugging they could not have been tugging
Forma interrogativa
Forma simple
could I tug? could you tug? could she tug? could we tug? could you tug? could they tug?
Forma con V-ing
could I be tugging? could you be tugging? could she be tugging? could we be tugging? could you be tugging? could they be tugging?
Perfecto
could I have tugged? could you have tugged? could she have tugged? could we have tugged? could you have tugged? could they have tugged?
Perfecto con V-ing
could I have been tugging? could you have been tugging? could she have been tugging? could we have been tugging? could you have been tugging? could they have been tugging?
Forma interro-negativa
Forma simple
could I not tug? could you not tug? could she not tug? could we not tug? could you not tug? could they not tug?
Forma con V-ing
could I not be tugging? could you not be tugging? could she not be tugging? could we not be tugging? could you not be tugging? could they not be tugging?
Perfecto
could I not have tugged? could you not have tugged? could she not have tugged? could we not have tugged? could you not have tugged? could they not have tugged?
Perfecto con V-ing
could I not have been tugging? could you not have been tugging? could she not have been tugging? could we not have been tugging? could you not have been tugging? could they not have been tugging?