I must discolor you must discolor he must discolor we must discolor you must discolor they must discolor
V-ing form
I must be discoloring you must be discoloring he must be discoloring we must be discoloring you must be discoloring they must be discoloring
Perfect
I must have discolored you must have discolored he must have discolored we must have discolored you must have discolored they must have discolored
V-ing perfect
I must have been discoloring you must have been discoloring he must have been discoloring we must have been discoloring you must have been discoloring they must have been discoloring
Negation
Simple form
I must not discolor you must not discolor he must not discolor we must not discolor you must not discolor they must not discolor
V-ing form
I must not be discoloring you must not be discoloring he must not be discoloring we must not be discoloring you must not be discoloring they must not be discoloring
Perfect
I must not have discolored you must not have discolored he must not have discolored we must not have discolored you must not have discolored they must not have discolored
V-ing perfect
I must not have been discoloring you must not have been discoloring he must not have been discoloring we must not have been discoloring you must not have been discoloring they must not have been discoloring
Interrogative form
Simple form
must I discolor? must you discolor? must he discolor? must we discolor? must you discolor? must they discolor?
V-ing form
must I be discoloring? must you be discoloring? must he be discoloring? must we be discoloring? must you be discoloring? must they be discoloring?
Perfect
must I have discolored? must you have discolored? must he have discolored? must we have discolored? must you have discolored? must they have discolored?
V-ing perfect
must I have been discoloring? must you have been discoloring? must he have been discoloring? must we have been discoloring? must you have been discoloring? must they have been discoloring?
Interro-negative form
Simple form
must I not discolor? must you not discolor? must he not discolor? must we not discolor? must you not discolor? must they not discolor?
V-ing form
must I not be discoloring? must you not be discoloring? must he not be discoloring? must we not be discoloring? must you not be discoloring? must they not be discoloring?
Perfect
must I not have discolored? must you not have discolored? must he not have discolored? must we not have discolored? must you not have discolored? must they not have discolored?
V-ing perfect
must I not have been discoloring? must you not have been discoloring? must he not have been discoloring? must we not have been discoloring? must you not have been discoloring? must they not have been discoloring?