I can extract you can extract he can extract we can extract you can extract they can extract
V-ing form
I can be extracting you can be extracting he can be extracting we can be extracting you can be extracting they can be extracting
Perfect
I can have extracted you can have extracted he can have extracted we can have extracted you can have extracted they can have extracted
V-ing perfect
I can have been extracting you can have been extracting he can have been extracting we can have been extracting you can have been extracting they can have been extracting
Negation
Simple form
I can't extract you can't extract he can't extract we can't extract you can't extract they can't extract
V-ing form
I can't be extracting you can't be extracting he can't be extracting we can't be extracting you can't be extracting they can't be extracting
Perfect
I can't have extracted you can't have extracted he can't have extracted we can't have extracted you can't have extracted they can't have extracted
V-ing perfect
I can't have been extracting you can't have been extracting he can't have been extracting we can't have been extracting you can't have been extracting they can't have been extracting
Interrogative form
Simple form
can I extract? can you extract? can he extract? can we extract? can you extract? can they extract?
V-ing form
can I be extracting? can you be extracting? can he be extracting? can we be extracting? can you be extracting? can they be extracting?
Perfect
can I have extracted? can you have extracted? can he have extracted? can we have extracted? can you have extracted? can they have extracted?
V-ing perfect
can I have been extracting? can you have been extracting? can he have been extracting? can we have been extracting? can you have been extracting? can they have been extracting?
Interro-negative form
Simple form
can't I extract? can't you extract? can't he extract? can't we extract? can't you extract? can't they extract?
V-ing form
can't I be extracting? can't you be extracting? can't he be extracting? can't we be extracting? can't you be extracting? can't they be extracting?
Perfect
can't I have extracted? can't you have extracted? can't he have extracted? can't we have extracted? can't you have extracted? can't they have extracted?
V-ing perfect
can't I have been extracting? can't you have been extracting? can't he have been extracting? can't we have been extracting? can't you have been extracting? can't they have been extracting?