Regular verb: knock - knocked - knocked
Simple form | V-ing form |
I can knock you can knock he can knock we can knock you can knock they can knock | I can be knocking you can be knocking he can be knocking we can be knocking you can be knocking they can be knocking |
Perfect | V-ing perfect |
I can have knocked you can have knocked he can have knocked we can have knocked you can have knocked they can have knocked | I can have been knocking you can have been knocking he can have been knocking we can have been knocking you can have been knocking they can have been knocking |
Simple form | V-ing form |
I can't knock you can't knock he can't knock we can't knock you can't knock they can't knock | I can't be knocking you can't be knocking he can't be knocking we can't be knocking you can't be knocking they can't be knocking |
Perfect | V-ing perfect |
I can't have knocked you can't have knocked he can't have knocked we can't have knocked you can't have knocked they can't have knocked | I can't have been knocking you can't have been knocking he can't have been knocking we can't have been knocking you can't have been knocking they can't have been knocking |
Simple form | V-ing form |
can I knock? can you knock? can he knock? can we knock? can you knock? can they knock? | can I be knocking? can you be knocking? can he be knocking? can we be knocking? can you be knocking? can they be knocking? |
Perfect | V-ing perfect |
can I have knocked? can you have knocked? can he have knocked? can we have knocked? can you have knocked? can they have knocked? | can I have been knocking? can you have been knocking? can he have been knocking? can we have been knocking? can you have been knocking? can they have been knocking? |
Simple form | V-ing form |
can't I knock? can't you knock? can't he knock? can't we knock? can't you knock? can't they knock? | can't I be knocking? can't you be knocking? can't he be knocking? can't we be knocking? can't you be knocking? can't they be knocking? |
Perfect | V-ing perfect |
can't I have knocked? can't you have knocked? can't he have knocked? can't we have knocked? can't you have knocked? can't they have knocked? | can't I have been knocking? can't you have been knocking? can't he have been knocking? can't we have been knocking? can't you have been knocking? can't they have been knocking? |