I could date you could date he could date we could date you could date they could date
V-ing form
I could be dating you could be dating he could be dating we could be dating you could be dating they could be dating
Perfect
I could have dated you could have dated he could have dated we could have dated you could have dated they could have dated
V-ing perfect
I could have been dating you could have been dating he could have been dating we could have been dating you could have been dating they could have been dating
Negation
Simple form
I could not date you could not date he could not date we could not date you could not date they could not date
V-ing form
I could not be dating you could not be dating he could not be dating we could not be dating you could not be dating they could not be dating
Perfect
I could not have dated you could not have dated he could not have dated we could not have dated you could not have dated they could not have dated
V-ing perfect
I could not have been dating you could not have been dating he could not have been dating we could not have been dating you could not have been dating they could not have been dating
Interrogative form
Simple form
could I date? could you date? could he date? could we date? could you date? could they date?
V-ing form
could I be dating? could you be dating? could he be dating? could we be dating? could you be dating? could they be dating?
Perfect
could I have dated? could you have dated? could he have dated? could we have dated? could you have dated? could they have dated?
V-ing perfect
could I have been dating? could you have been dating? could he have been dating? could we have been dating? could you have been dating? could they have been dating?
Interro-negative form
Simple form
could I not date? could you not date? could he not date? could we not date? could you not date? could they not date?
V-ing form
could I not be dating? could you not be dating? could he not be dating? could we not be dating? could you not be dating? could they not be dating?
Perfect
could I not have dated? could you not have dated? could he not have dated? could we not have dated? could you not have dated? could they not have dated?
V-ing perfect
could I not have been dating? could you not have been dating? could he not have been dating? could we not have been dating? could you not have been dating? could they not have been dating?