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