I could query you could query he could query we could query you could query they could query
Forma con V-ing
I could be querying you could be querying he could be querying we could be querying you could be querying they could be querying
Perfecto
I could have queried you could have queried he could have queried we could have queried you could have queried they could have queried
Perfecto con V-ing
I could have been querying you could have been querying he could have been querying we could have been querying you could have been querying they could have been querying
Negación
Forma simple
I could not query you could not query he could not query we could not query you could not query they could not query
Forma con V-ing
I could not be querying you could not be querying he could not be querying we could not be querying you could not be querying they could not be querying
Perfecto
I could not have queried you could not have queried he could not have queried we could not have queried you could not have queried they could not have queried
Perfecto con V-ing
I could not have been querying you could not have been querying he could not have been querying we could not have been querying you could not have been querying they could not have been querying
Forma interrogativa
Forma simple
could I query? could you query? could he query? could we query? could you query? could they query?
Forma con V-ing
could I be querying? could you be querying? could he be querying? could we be querying? could you be querying? could they be querying?
Perfecto
could I have queried? could you have queried? could he have queried? could we have queried? could you have queried? could they have queried?
Perfecto con V-ing
could I have been querying? could you have been querying? could he have been querying? could we have been querying? could you have been querying? could they have been querying?
Forma interro-negativa
Forma simple
could I not query? could you not query? could he not query? could we not query? could you not query? could they not query?
Forma con V-ing
could I not be querying? could you not be querying? could he not be querying? could we not be querying? could you not be querying? could they not be querying?
Perfecto
could I not have queried? could you not have queried? could he not have queried? could we not have queried? could you not have queried? could they not have queried?
Perfecto con V-ing
could I not have been querying? could you not have been querying? could he not have been querying? could we not have been querying? could you not have been querying? could they not have been querying?