I must opt you must opt she must opt we must opt you must opt they must opt
V-ing form
I must be opting you must be opting she must be opting we must be opting you must be opting they must be opting
Perfect
I must have opted you must have opted she 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 she must have been opting we must have been opting you must have been opting they must have been opting
Negation
Simple form
I mustn't opt you mustn't opt she mustn't opt we mustn't opt you mustn't opt they mustn't opt
V-ing form
I mustn't be opting you mustn't be opting she mustn't be opting we mustn't be opting you mustn't be opting they mustn't be opting
Perfect
I mustn't have opted you mustn't have opted she mustn't have opted we mustn't have opted you mustn't have opted they mustn't have opted
V-ing perfect
I mustn't have been opting you mustn't have been opting she mustn't have been opting we mustn't have been opting you mustn't have been opting they mustn't have been opting
Interrogative form
Simple form
must I opt? must you opt? must she opt? must we opt? must you opt? must they opt?
V-ing form
must I be opting? must you be opting? must she be opting? must we be opting? must you be opting? must they be opting?
Perfect
must I have opted? must you have opted? must she 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 she have been opting? must we have been opting? must you have been opting? must they have been opting?
Interro-negative form
Simple form
mustn't I opt? mustn't you opt? mustn't she opt? mustn't we opt? mustn't you opt? mustn't they opt?
V-ing form
mustn't I be opting? mustn't you be opting? mustn't she be opting? mustn't we be opting? mustn't you be opting? mustn't they be opting?
Perfect
mustn't I have opted? mustn't you have opted? mustn't she have opted? mustn't we have opted? mustn't you have opted? mustn't they have opted?
V-ing perfect
mustn't I have been opting? mustn't you have been opting? mustn't she have been opting? mustn't we have been opting? mustn't you have been opting? mustn't they have been opting?