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