I can rock you can rock he can rock we can rock you can rock they can rock
V-ing form
I can be rocking you can be rocking he can be rocking we can be rocking you can be rocking they can be rocking
Perfect
I can have rocked you can have rocked he can have rocked we can have rocked you can have rocked they can have rocked
V-ing perfect
I can have been rocking you can have been rocking he can have been rocking we can have been rocking you can have been rocking they can have been rocking
Negation
Simple form
I can't rock you can't rock he can't rock we can't rock you can't rock they can't rock
V-ing form
I can't be rocking you can't be rocking he can't be rocking we can't be rocking you can't be rocking they can't be rocking
Perfect
I can't have rocked you can't have rocked he can't have rocked we can't have rocked you can't have rocked they can't have rocked
V-ing perfect
I can't have been rocking you can't have been rocking he can't have been rocking we can't have been rocking you can't have been rocking they can't have been rocking
Interrogative form
Simple form
can I rock? can you rock? can he rock? can we rock? can you rock? can they rock?
V-ing form
can I be rocking? can you be rocking? can he be rocking? can we be rocking? can you be rocking? can they be rocking?
Perfect
can I have rocked? can you have rocked? can he have rocked? can we have rocked? can you have rocked? can they have rocked?
V-ing perfect
can I have been rocking? can you have been rocking? can he have been rocking? can we have been rocking? can you have been rocking? can they have been rocking?
Interro-negative form
Simple form
can't I rock? can't you rock? can't he rock? can't we rock? can't you rock? can't they rock?
V-ing form
can't I be rocking? can't you be rocking? can't he be rocking? can't we be rocking? can't you be rocking? can't they be rocking?
Perfect
can't I have rocked? can't you have rocked? can't he have rocked? can't we have rocked? can't you have rocked? can't they have rocked?
V-ing perfect
can't I have been rocking? can't you have been rocking? can't he have been rocking? can't we have been rocking? can't you have been rocking? can't they have been rocking?