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 couldn't light you couldn't light he couldn't light we couldn't light you couldn't light they couldn't light
V-ing form
I couldn't be lighting you couldn't be lighting he couldn't be lighting we couldn't be lighting you couldn't be lighting they couldn't be lighting
Perfect
I couldn't have lit you couldn't have lit he couldn't have lit we couldn't have lit you couldn't have lit they couldn't have lit
V-ing perfect
I couldn't have been lighting you couldn't have been lighting he couldn't have been lighting we couldn't have been lighting you couldn't have been lighting they couldn't 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
couldn't I light? couldn't you light? couldn't he light? couldn't we light? couldn't you light? couldn't they light?
V-ing form
couldn't I be lighting? couldn't you be lighting? couldn't he be lighting? couldn't we be lighting? couldn't you be lighting? couldn't they be lighting?
Perfect
couldn't I have lit? couldn't you have lit? couldn't he have lit? couldn't we have lit? couldn't you have lit? couldn't they have lit?
V-ing perfect
couldn't I have been lighting? couldn't you have been lighting? couldn't he have been lighting? couldn't we have been lighting? couldn't you have been lighting? couldn't they have been lighting?