I must opt you must opt he must opt we must opt you must opt they must opt
V-ing form
I must be opting you must be opting he must be opting we must be opting you must be opting they must be opting
Perfect
I must have opted you must have opted he must have opted we must have opted you must have opted they must have opted
V-ing perfect
I must have been opting you must have been opting he must have been opting we must have been opting you must have been opting they must have been opting
Negation
Simple form
I must not opt you must not opt he must not opt we must not opt you must not opt they must not opt
V-ing form
I must not be opting you must not be opting he must not be opting we must not be opting you must not be opting they must not be opting
Perfect
I must not have opted you must not have opted he must not have opted we must not have opted you must not have opted they must not have opted
V-ing perfect
I must not have been opting you must not have been opting he must not have been opting we must not have been opting you must not have been opting they must not have been opting
Interrogative form
Simple form
must I opt? must you opt? must he opt? must we opt? must you opt? must they opt?
V-ing form
must I be opting? must you be opting? must he be opting? must we be opting? must you be opting? must they be opting?
Perfect
must I have opted? must you have opted? must he have opted? must we have opted? must you have opted? must they have opted?
V-ing perfect
must I have been opting? must you have been opting? must he have been opting? must we have been opting? must you have been opting? must they have been opting?
Interro-negative form
Simple form
must I not opt? must you not opt? must he not opt? must we not opt? must you not opt? must they not opt?
V-ing form
must I not be opting? must you not be opting? must he not be opting? must we not be opting? must you not be opting? must they not be opting?
Perfect
must I not have opted? must you not have opted? must he not have opted? must we not have opted? must you not have opted? must they not have opted?
V-ing perfect
must I not have been opting? must you not have been opting? must he not have been opting? must we not have been opting? must you not have been opting? must they not have been opting?