I could light you could light he could light we could light you could light they could light
V-ing form
I could be lighting you could be lighting he could be lighting we could be lighting you could be lighting they could be lighting
Perfect
I could have lit you could have lit he could have lit we could have lit you could have lit they could have lit
V-ing perfect
I could have been lighting you could have been lighting he could have been lighting we could have been lighting you could have been lighting they could have been lighting
Negation
Simple form
I could not light you could not light he could not light we could not light you could not light they could not light
V-ing form
I could not be lighting you could not be lighting he could not be lighting we could not be lighting you could not be lighting they could not be lighting
Perfect
I could not have lit you could not have lit he could not have lit we could not have lit you could not have lit they could not have lit
V-ing perfect
I could not have been lighting you could not have been lighting he could not have been lighting we could not have been lighting you could not have been lighting they could not have been lighting
Interrogative form
Simple form
could I light? could you light? could he light? could we light? could you light? could they light?
V-ing form
could I be lighting? could you be lighting? could he be lighting? could we be lighting? could you be lighting? could they be lighting?
Perfect
could I have lit? could you have lit? could he have lit? could we have lit? could you have lit? could they have lit?
V-ing perfect
could I have been lighting? could you have been lighting? could he have been lighting? could we have been lighting? could you have been lighting? could they have been lighting?
Interro-negative form
Simple form
could I not light? could you not light? could he not light? could we not light? could you not light? could they not light?
V-ing form
could I not be lighting? could you not be lighting? could he not be lighting? could we not be lighting? could you not be lighting? could they not be lighting?
Perfect
could I not have lit? could you not have lit? could he not have lit? could we not have lit? could you not have lit? could they not have lit?
V-ing perfect
could I not have been lighting? could you not have been lighting? could he not have been lighting? could we not have been lighting? could you not have been lighting? could they not have been lighting?