I could store you could store he could store we could store you could store they could store
V-ing form
I could be storing you could be storing he could be storing we could be storing you could be storing they could be storing
Perfect
I could have stored you could have stored he could have stored we could have stored you could have stored they could have stored
V-ing perfect
I could have been storing you could have been storing he could have been storing we could have been storing you could have been storing they could have been storing
Negation
Simple form
I could not store you could not store he could not store we could not store you could not store they could not store
V-ing form
I could not be storing you could not be storing he could not be storing we could not be storing you could not be storing they could not be storing
Perfect
I could not have stored you could not have stored he could not have stored we could not have stored you could not have stored they could not have stored
V-ing perfect
I could not have been storing you could not have been storing he could not have been storing we could not have been storing you could not have been storing they could not have been storing
Interrogative form
Simple form
could I store? could you store? could he store? could we store? could you store? could they store?
V-ing form
could I be storing? could you be storing? could he be storing? could we be storing? could you be storing? could they be storing?
Perfect
could I have stored? could you have stored? could he have stored? could we have stored? could you have stored? could they have stored?
V-ing perfect
could I have been storing? could you have been storing? could he have been storing? could we have been storing? could you have been storing? could they have been storing?
Interro-negative form
Simple form
could I not store? could you not store? could he not store? could we not store? could you not store? could they not store?
V-ing form
could I not be storing? could you not be storing? could he not be storing? could we not be storing? could you not be storing? could they not be storing?
Perfect
could I not have stored? could you not have stored? could he not have stored? could we not have stored? could you not have stored? could they not have stored?
V-ing perfect
could I not have been storing? could you not have been storing? could he not have been storing? could we not have been storing? could you not have been storing? could they not have been storing?