I can backcheck you can backcheck he can backcheck we can backcheck you can backcheck they can backcheck
Forme en V-ing
I can be backchecking you can be backchecking he can be backchecking we can be backchecking you can be backchecking they can be backchecking
Perfect
I can have backchecked you can have backchecked he can have backchecked we can have backchecked you can have backchecked they can have backchecked
Perfect en V-ing
I can have been backchecking you can have been backchecking he can have been backchecking we can have been backchecking you can have been backchecking they can have been backchecking
Négation
Forme simple
I can't backcheck you can't backcheck he can't backcheck we can't backcheck you can't backcheck they can't backcheck
Forme en V-ing
I can't be backchecking you can't be backchecking he can't be backchecking we can't be backchecking you can't be backchecking they can't be backchecking
Perfect
I can't have backchecked you can't have backchecked he can't have backchecked we can't have backchecked you can't have backchecked they can't have backchecked
Perfect en V-ing
I can't have been backchecking you can't have been backchecking he can't have been backchecking we can't have been backchecking you can't have been backchecking they can't have been backchecking
Forme interrogative
Forme simple
can I backcheck? can you backcheck? can he backcheck? can we backcheck? can you backcheck? can they backcheck?
Forme en V-ing
can I be backchecking? can you be backchecking? can he be backchecking? can we be backchecking? can you be backchecking? can they be backchecking?
Perfect
can I have backchecked? can you have backchecked? can he have backchecked? can we have backchecked? can you have backchecked? can they have backchecked?
Perfect en V-ing
can I have been backchecking? can you have been backchecking? can he have been backchecking? can we have been backchecking? can you have been backchecking? can they have been backchecking?
Forme interro-négative
Forme simple
can't I backcheck? can't you backcheck? can't he backcheck? can't we backcheck? can't you backcheck? can't they backcheck?
Forme en V-ing
can't I be backchecking? can't you be backchecking? can't he be backchecking? can't we be backchecking? can't you be backchecking? can't they be backchecking?
Perfect
can't I have backchecked? can't you have backchecked? can't he have backchecked? can't we have backchecked? can't you have backchecked? can't they have backchecked?
Perfect en V-ing
can't I have been backchecking? can't you have been backchecking? can't he have been backchecking? can't we have been backchecking? can't you have been backchecking? can't they have been backchecking?