
Regelmäßiges Verb: knock - knocked - knocked
Einfache Form | Form mit V-ing | 
| I could knock you could knock she could knock we could knock you could knock they could knock  | I could be knocking you could be knocking she could be knocking we could be knocking you could be knocking they could be knocking  | 
Perfekt | Perfekt mit V-ing | 
| I could have knocked you could have knocked she could have knocked we could have knocked you could have knocked they could have knocked  | I could have been knocking you could have been knocking she could have been knocking we could have been knocking you could have been knocking they could have been knocking  | 
Einfache Form | Form mit V-ing | 
| I couldn't knock you couldn't knock she couldn't knock we couldn't knock you couldn't knock they couldn't knock  | I couldn't be knocking you couldn't be knocking she couldn't be knocking we couldn't be knocking you couldn't be knocking they couldn't be knocking  | 
Perfekt | Perfekt mit V-ing | 
| I couldn't have knocked you couldn't have knocked she couldn't have knocked we couldn't have knocked you couldn't have knocked they couldn't have knocked  | I couldn't have been knocking you couldn't have been knocking she couldn't have been knocking we couldn't have been knocking you couldn't have been knocking they couldn't have been knocking  | 
Einfache Form | Form mit V-ing | 
| could I knock? could you knock? could she knock? could we knock? could you knock? could they knock?  | could I be knocking? could you be knocking? could she be knocking? could we be knocking? could you be knocking? could they be knocking?  | 
Perfekt | Perfekt mit V-ing | 
| could I have knocked? could you have knocked? could she have knocked? could we have knocked? could you have knocked? could they have knocked?  | could I have been knocking? could you have been knocking? could she have been knocking? could we have been knocking? could you have been knocking? could they have been knocking?  | 
Einfache Form | Form mit V-ing | 
| couldn't I knock? couldn't you knock? couldn't she knock? couldn't we knock? couldn't you knock? couldn't they knock?  | couldn't I be knocking? couldn't you be knocking? couldn't she be knocking? couldn't we be knocking? couldn't you be knocking? couldn't they be knocking?  | 
Perfekt | Perfekt mit V-ing | 
| couldn't I have knocked? couldn't you have knocked? couldn't she have knocked? couldn't we have knocked? couldn't you have knocked? couldn't they have knocked?  | couldn't I have been knocking? couldn't you have been knocking? couldn't she have been knocking? couldn't we have been knocking? couldn't you have been knocking? couldn't they have been knocking?  |