I could dine you could dine he could dine we could dine you could dine they could dine
V-ing form
I could be dining you could be dining he could be dining we could be dining you could be dining they could be dining
Perfect
I could have dined you could have dined he could have dined we could have dined you could have dined they could have dined
V-ing perfect
I could have been dining you could have been dining he could have been dining we could have been dining you could have been dining they could have been dining
Negation
Simple form
I could not dine you could not dine he could not dine we could not dine you could not dine they could not dine
V-ing form
I could not be dining you could not be dining he could not be dining we could not be dining you could not be dining they could not be dining
Perfect
I could not have dined you could not have dined he could not have dined we could not have dined you could not have dined they could not have dined
V-ing perfect
I could not have been dining you could not have been dining he could not have been dining we could not have been dining you could not have been dining they could not have been dining
Interrogative form
Simple form
could I dine? could you dine? could he dine? could we dine? could you dine? could they dine?
V-ing form
could I be dining? could you be dining? could he be dining? could we be dining? could you be dining? could they be dining?
Perfect
could I have dined? could you have dined? could he have dined? could we have dined? could you have dined? could they have dined?
V-ing perfect
could I have been dining? could you have been dining? could he have been dining? could we have been dining? could you have been dining? could they have been dining?
Interro-negative form
Simple form
could I not dine? could you not dine? could he not dine? could we not dine? could you not dine? could they not dine?
V-ing form
could I not be dining? could you not be dining? could he not be dining? could we not be dining? could you not be dining? could they not be dining?
Perfect
could I not have dined? could you not have dined? could he not have dined? could we not have dined? could you not have dined? could they not have dined?
V-ing perfect
could I not have been dining? could you not have been dining? could he not have been dining? could we not have been dining? could you not have been dining? could they not have been dining?