I could refridgerate you could refridgerate he could refridgerate we could refridgerate you could refridgerate they could refridgerate
V-ing form
I could be refridgerating you could be refridgerating he could be refridgerating we could be refridgerating you could be refridgerating they could be refridgerating
Perfect
I could have refridgerated you could have refridgerated he could have refridgerated we could have refridgerated you could have refridgerated they could have refridgerated
V-ing perfect
I could have been refridgerating you could have been refridgerating he could have been refridgerating we could have been refridgerating you could have been refridgerating they could have been refridgerating
Negation
Simple form
I could not refridgerate you could not refridgerate he could not refridgerate we could not refridgerate you could not refridgerate they could not refridgerate
V-ing form
I could not be refridgerating you could not be refridgerating he could not be refridgerating we could not be refridgerating you could not be refridgerating they could not be refridgerating
Perfect
I could not have refridgerated you could not have refridgerated he could not have refridgerated we could not have refridgerated you could not have refridgerated they could not have refridgerated
V-ing perfect
I could not have been refridgerating you could not have been refridgerating he could not have been refridgerating we could not have been refridgerating you could not have been refridgerating they could not have been refridgerating
Interrogative form
Simple form
could I refridgerate? could you refridgerate? could he refridgerate? could we refridgerate? could you refridgerate? could they refridgerate?
V-ing form
could I be refridgerating? could you be refridgerating? could he be refridgerating? could we be refridgerating? could you be refridgerating? could they be refridgerating?
Perfect
could I have refridgerated? could you have refridgerated? could he have refridgerated? could we have refridgerated? could you have refridgerated? could they have refridgerated?
V-ing perfect
could I have been refridgerating? could you have been refridgerating? could he have been refridgerating? could we have been refridgerating? could you have been refridgerating? could they have been refridgerating?
Interro-negative form
Simple form
could I not refridgerate? could you not refridgerate? could he not refridgerate? could we not refridgerate? could you not refridgerate? could they not refridgerate?
V-ing form
could I not be refridgerating? could you not be refridgerating? could he not be refridgerating? could we not be refridgerating? could you not be refridgerating? could they not be refridgerating?
Perfect
could I not have refridgerated? could you not have refridgerated? could he not have refridgerated? could we not have refridgerated? could you not have refridgerated? could they not have refridgerated?
V-ing perfect
could I not have been refridgerating? could you not have been refridgerating? could he not have been refridgerating? could we not have been refridgerating? could you not have been refridgerating? could they not have been refridgerating?