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