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