I can look you can look he can look we can look you can look they can look
V-ing form
I can be looking you can be looking he can be looking we can be looking you can be looking they can be looking
Perfect
I can have looked you can have looked he 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 he can have been looking we can have been looking you can have been looking they can have been looking
Negation
Simple form
I can't look you can't look he can't look we can't look you can't look they can't look
V-ing form
I can't be looking you can't be looking he can't be looking we can't be looking you can't be looking they can't be looking
Perfect
I can't have looked you can't have looked he can't have looked we can't have looked you can't have looked they can't have looked
V-ing perfect
I can't have been looking you can't have been looking he can't have been looking we can't have been looking you can't have been looking they can't have been looking
Interrogative form
Simple form
can I look? can you look? can he look? can we look? can you look? can they look?
V-ing form
can I be looking? can you be looking? can he be looking? can we be looking? can you be looking? can they be looking?
Perfect
can I have looked? can you have looked? can he 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 he have been looking? can we have been looking? can you have been looking? can they have been looking?
Interro-negative form
Simple form
can't I look? can't you look? can't he look? can't we look? can't you look? can't they look?
V-ing form
can't I be looking? can't you be looking? can't he be looking? can't we be looking? can't you be looking? can't they be looking?
Perfect
can't I have looked? can't you have looked? can't he have looked? can't we have looked? can't you have looked? can't they have looked?
V-ing perfect
can't I have been looking? can't you have been looking? can't he have been looking? can't we have been looking? can't you have been looking? can't they have been looking?