I can checker you can checker he can checker we can checker you can checker they can checker
Forme en V-ing
I can be checkering you can be checkering he can be checkering we can be checkering you can be checkering they can be checkering
Perfect
I can have checkered you can have checkered he can have checkered we can have checkered you can have checkered they can have checkered
Perfect en V-ing
I can have been checkering you can have been checkering he can have been checkering we can have been checkering you can have been checkering they can have been checkering
Négation
Forme simple
I cannot checker you cannot checker he cannot checker we cannot checker you cannot checker they cannot checker
Forme en V-ing
I cannot be checkering you cannot be checkering he cannot be checkering we cannot be checkering you cannot be checkering they cannot be checkering
Perfect
I cannot have checkered you cannot have checkered he cannot have checkered we cannot have checkered you cannot have checkered they cannot have checkered
Perfect en V-ing
I cannot have been checkering you cannot have been checkering he cannot have been checkering we cannot have been checkering you cannot have been checkering they cannot have been checkering
Forme interrogative
Forme simple
can I checker? can you checker? can he checker? can we checker? can you checker? can they checker?
Forme en V-ing
can I be checkering? can you be checkering? can he be checkering? can we be checkering? can you be checkering? can they be checkering?
Perfect
can I have checkered? can you have checkered? can he have checkered? can we have checkered? can you have checkered? can they have checkered?
Perfect en V-ing
can I have been checkering? can you have been checkering? can he have been checkering? can we have been checkering? can you have been checkering? can they have been checkering?
Forme interro-négative
Forme simple
can I not checker? can you not checker? can he not checker? can we not checker? can you not checker? can they not checker?
Forme en V-ing
can I not be checkering? can you not be checkering? can he not be checkering? can we not be checkering? can you not be checkering? can they not be checkering?
Perfect
can I not have checkered? can you not have checkered? can he not have checkered? can we not have checkered? can you not have checkered? can they not have checkered?
Perfect en V-ing
can I not have been checkering? can you not have been checkering? can he not have been checkering? can we not have been checkering? can you not have been checkering? can they not have been checkering?