I can look you can look she can look we can look you can look they can look
V-ing form
I can be looking you can be looking she can be looking we can be looking you can be looking they can be looking
Perfect
I can have looked you can have looked she can have looked we can have looked you can have looked they can have looked
V-ing perfect
I can have been looking you can have been looking she can have been looking we can have been looking you can have been looking they can have been looking
Negation
Simple form
I cannot look you cannot look she cannot look we cannot look you cannot look they cannot look
V-ing form
I cannot be looking you cannot be looking she cannot be looking we cannot be looking you cannot be looking they cannot be looking
Perfect
I cannot have looked you cannot have looked she cannot have looked we cannot have looked you cannot have looked they cannot have looked
V-ing perfect
I cannot have been looking you cannot have been looking she cannot have been looking we cannot have been looking you cannot have been looking they cannot have been looking
Interrogative form
Simple form
can I look? can you look? can she look? can we look? can you look? can they look?
V-ing form
can I be looking? can you be looking? can she be looking? can we be looking? can you be looking? can they be looking?
Perfect
can I have looked? can you have looked? can she have looked? can we have looked? can you have looked? can they have looked?
V-ing perfect
can I have been looking? can you have been looking? can she have been looking? can we have been looking? can you have been looking? can they have been looking?
Interro-negative form
Simple form
can I not look? can you not look? can she not look? can we not look? can you not look? can they not look?
V-ing form
can I not be looking? can you not be looking? can she not be looking? can we not be looking? can you not be looking? can they not be looking?
Perfect
can I not have looked? can you not have looked? can she not have looked? can we not have looked? can you not have looked? can they not have looked?
V-ing perfect
can I not have been looking? can you not have been looking? can she not have been looking? can we not have been looking? can you not have been looking? can they not have been looking?