
Unregelmäßiges Verb: undertake - undertook - undertaken
Einfache Form | Form mit V-ing | 
| I can undertake you can undertake he can undertake we can undertake you can undertake they can undertake  | I can be undertaking you can be undertaking he can be undertaking we can be undertaking you can be undertaking they can be undertaking  | 
Perfekt | Perfekt mit V-ing | 
| I can have undertaken you can have undertaken he can have undertaken we can have undertaken you can have undertaken they can have undertaken  | I can have been undertaking you can have been undertaking he can have been undertaking we can have been undertaking you can have been undertaking they can have been undertaking  | 
Einfache Form | Form mit V-ing | 
| I can't undertake you can't undertake he can't undertake we can't undertake you can't undertake they can't undertake  | I can't be undertaking you can't be undertaking he can't be undertaking we can't be undertaking you can't be undertaking they can't be undertaking  | 
Perfekt | Perfekt mit V-ing | 
| I can't have undertaken you can't have undertaken he can't have undertaken we can't have undertaken you can't have undertaken they can't have undertaken  | I can't have been undertaking you can't have been undertaking he can't have been undertaking we can't have been undertaking you can't have been undertaking they can't have been undertaking  | 
Einfache Form | Form mit V-ing | 
| can I undertake? can you undertake? can he undertake? can we undertake? can you undertake? can they undertake?  | can I be undertaking? can you be undertaking? can he be undertaking? can we be undertaking? can you be undertaking? can they be undertaking?  | 
Perfekt | Perfekt mit V-ing | 
| can I have undertaken? can you have undertaken? can he have undertaken? can we have undertaken? can you have undertaken? can they have undertaken?  | can I have been undertaking? can you have been undertaking? can he have been undertaking? can we have been undertaking? can you have been undertaking? can they have been undertaking?  | 
Einfache Form | Form mit V-ing | 
| can't I undertake? can't you undertake? can't he undertake? can't we undertake? can't you undertake? can't they undertake?  | can't I be undertaking? can't you be undertaking? can't he be undertaking? can't we be undertaking? can't you be undertaking? can't they be undertaking?  | 
Perfekt | Perfekt mit V-ing | 
| can't I have undertaken? can't you have undertaken? can't he have undertaken? can't we have undertaken? can't you have undertaken? can't they have undertaken?  | can't I have been undertaking? can't you have been undertaking? can't he have been undertaking? can't we have been undertaking? can't you have been undertaking? can't they have been undertaking?  |