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