I can back you can back he can back we can back you can back they can back
Form mit V-ing
I can be backing you can be backing he can be backing we can be backing you can be backing they can be backing
Perfekt
I can have backed you can have backed he can have backed we can have backed you can have backed they can have backed
Perfekt mit V-ing
I can have been backing you can have been backing he can have been backing we can have been backing you can have been backing they can have been backing
Negation
Einfache Form
I can't back you can't back he can't back we can't back you can't back they can't back
Form mit V-ing
I can't be backing you can't be backing he can't be backing we can't be backing you can't be backing they can't be backing
Perfekt
I can't have backed you can't have backed he can't have backed we can't have backed you can't have backed they can't have backed
Perfekt mit V-ing
I can't have been backing you can't have been backing he can't have been backing we can't have been backing you can't have been backing they can't have been backing
Fragende Form
Einfache Form
can I back? can you back? can he back? can we back? can you back? can they back?
Form mit V-ing
can I be backing? can you be backing? can he be backing? can we be backing? can you be backing? can they be backing?
Perfekt
can I have backed? can you have backed? can he have backed? can we have backed? can you have backed? can they have backed?
Perfekt mit V-ing
can I have been backing? can you have been backing? can he have been backing? can we have been backing? can you have been backing? can they have been backing?
Fragende Negation Form
Einfache Form
can't I back? can't you back? can't he back? can't we back? can't you back? can't they back?
Form mit V-ing
can't I be backing? can't you be backing? can't he be backing? can't we be backing? can't you be backing? can't they be backing?
Perfekt
can't I have backed? can't you have backed? can't he have backed? can't we have backed? can't you have backed? can't they have backed?
Perfekt mit V-ing
can't I have been backing? can't you have been backing? can't he have been backing? can't we have been backing? can't you have been backing? can't they have been backing?