I could repair you could repair he could repair we could repair you could repair they could repair
V-ing form
I could be repairing you could be repairing he could be repairing we could be repairing you could be repairing they could be repairing
Perfect
I could have repaired you could have repaired he could have repaired we could have repaired you could have repaired they could have repaired
V-ing perfect
I could have been repairing you could have been repairing he could have been repairing we could have been repairing you could have been repairing they could have been repairing
Negation
Simple form
I couldn't repair you couldn't repair he couldn't repair we couldn't repair you couldn't repair they couldn't repair
V-ing form
I couldn't be repairing you couldn't be repairing he couldn't be repairing we couldn't be repairing you couldn't be repairing they couldn't be repairing
Perfect
I couldn't have repaired you couldn't have repaired he couldn't have repaired we couldn't have repaired you couldn't have repaired they couldn't have repaired
V-ing perfect
I couldn't have been repairing you couldn't have been repairing he couldn't have been repairing we couldn't have been repairing you couldn't have been repairing they couldn't have been repairing
Interrogative form
Simple form
could I repair? could you repair? could he repair? could we repair? could you repair? could they repair?
V-ing form
could I be repairing? could you be repairing? could he be repairing? could we be repairing? could you be repairing? could they be repairing?
Perfect
could I have repaired? could you have repaired? could he have repaired? could we have repaired? could you have repaired? could they have repaired?
V-ing perfect
could I have been repairing? could you have been repairing? could he have been repairing? could we have been repairing? could you have been repairing? could they have been repairing?
Interro-negative form
Simple form
couldn't I repair? couldn't you repair? couldn't he repair? couldn't we repair? couldn't you repair? couldn't they repair?
V-ing form
couldn't I be repairing? couldn't you be repairing? couldn't he be repairing? couldn't we be repairing? couldn't you be repairing? couldn't they be repairing?
Perfect
couldn't I have repaired? couldn't you have repaired? couldn't he have repaired? couldn't we have repaired? couldn't you have repaired? couldn't they have repaired?
V-ing perfect
couldn't I have been repairing? couldn't you have been repairing? couldn't he have been repairing? couldn't we have been repairing? couldn't you have been repairing? couldn't they have been repairing?