I could line you could line she could line we could line you could line they could line
V-ing form
I could be lining you could be lining she could be lining we could be lining you could be lining they could be lining
Perfect
I could have lined you could have lined she could have lined we could have lined you could have lined they could have lined
V-ing perfect
I could have been lining you could have been lining she could have been lining we could have been lining you could have been lining they could have been lining
Negation
Simple form
I couldn't line you couldn't line she couldn't line we couldn't line you couldn't line they couldn't line
V-ing form
I couldn't be lining you couldn't be lining she couldn't be lining we couldn't be lining you couldn't be lining they couldn't be lining
Perfect
I couldn't have lined you couldn't have lined she couldn't have lined we couldn't have lined you couldn't have lined they couldn't have lined
V-ing perfect
I couldn't have been lining you couldn't have been lining she couldn't have been lining we couldn't have been lining you couldn't have been lining they couldn't have been lining
Interrogative form
Simple form
could I line? could you line? could she line? could we line? could you line? could they line?
V-ing form
could I be lining? could you be lining? could she be lining? could we be lining? could you be lining? could they be lining?
Perfect
could I have lined? could you have lined? could she have lined? could we have lined? could you have lined? could they have lined?
V-ing perfect
could I have been lining? could you have been lining? could she have been lining? could we have been lining? could you have been lining? could they have been lining?
Interro-negative form
Simple form
couldn't I line? couldn't you line? couldn't she line? couldn't we line? couldn't you line? couldn't they line?
V-ing form
couldn't I be lining? couldn't you be lining? couldn't she be lining? couldn't we be lining? couldn't you be lining? couldn't they be lining?
Perfect
couldn't I have lined? couldn't you have lined? couldn't she have lined? couldn't we have lined? couldn't you have lined? couldn't they have lined?
V-ing perfect
couldn't I have been lining? couldn't you have been lining? couldn't she have been lining? couldn't we have been lining? couldn't you have been lining? couldn't they have been lining?