I can knock you can knock she can knock we can knock you can knock they can knock
Form mit V-ing
I can be knocking you can be knocking she can be knocking we can be knocking you can be knocking they can be knocking
Perfekt
I can have knocked you can have knocked she can have knocked we can have knocked you can have knocked they can have knocked
Perfekt mit V-ing
I can have been knocking you can have been knocking she can have been knocking we can have been knocking you can have been knocking they can have been knocking
Negation
Einfache Form
I can't knock you can't knock she can't knock we can't knock you can't knock they can't knock
Form mit V-ing
I can't be knocking you can't be knocking she can't be knocking we can't be knocking you can't be knocking they can't be knocking
Perfekt
I can't have knocked you can't have knocked she can't have knocked we can't have knocked you can't have knocked they can't have knocked
Perfekt mit V-ing
I can't have been knocking you can't have been knocking she can't have been knocking we can't have been knocking you can't have been knocking they can't have been knocking
Fragende Form
Einfache Form
can I knock? can you knock? can she knock? can we knock? can you knock? can they knock?
Form mit V-ing
can I be knocking? can you be knocking? can she be knocking? can we be knocking? can you be knocking? can they be knocking?
Perfekt
can I have knocked? can you have knocked? can she have knocked? can we have knocked? can you have knocked? can they have knocked?
Perfekt mit V-ing
can I have been knocking? can you have been knocking? can she have been knocking? can we have been knocking? can you have been knocking? can they have been knocking?
Fragende Negation Form
Einfache Form
can't I knock? can't you knock? can't she knock? can't we knock? can't you knock? can't they knock?
Form mit V-ing
can't I be knocking? can't you be knocking? can't she be knocking? can't we be knocking? can't you be knocking? can't they be knocking?
Perfekt
can't I have knocked? can't you have knocked? can't she have knocked? can't we have knocked? can't you have knocked? can't they have knocked?
Perfekt mit V-ing
can't I have been knocking? can't you have been knocking? can't she have been knocking? can't we have been knocking? can't you have been knocking? can't they have been knocking?