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 could not overlook you could not overlook he could not overlook we could not overlook you could not overlook they could not overlook
V-ing form
I could not be overlooking you could not be overlooking he could not be overlooking we could not be overlooking you could not be overlooking they could not be overlooking
Perfect
I could not have overlooked you could not have overlooked he could not have overlooked we could not have overlooked you could not have overlooked they could not have overlooked
V-ing perfect
I could not have been overlooking you could not have been overlooking he could not have been overlooking we could not have been overlooking you could not have been overlooking they could not 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
could I not overlook? could you not overlook? could he not overlook? could we not overlook? could you not overlook? could they not overlook?
V-ing form
could I not be overlooking? could you not be overlooking? could he not be overlooking? could we not be overlooking? could you not be overlooking? could they not be overlooking?
Perfect
could I not have overlooked? could you not have overlooked? could he not have overlooked? could we not have overlooked? could you not have overlooked? could they not have overlooked?
V-ing perfect
could I not have been overlooking? could you not have been overlooking? could he not have been overlooking? could we not have been overlooking? could you not have been overlooking? could they not have been overlooking?