I can countersign you can countersign he can countersign we can countersign you can countersign they can countersign
Forme en V-ing
I can be countersigning you can be countersigning he can be countersigning we can be countersigning you can be countersigning they can be countersigning
Perfect
I can have countersigned you can have countersigned he can have countersigned we can have countersigned you can have countersigned they can have countersigned
Perfect en V-ing
I can have been countersigning you can have been countersigning he can have been countersigning we can have been countersigning you can have been countersigning they can have been countersigning
Négation
Forme simple
I cannot countersign you cannot countersign he cannot countersign we cannot countersign you cannot countersign they cannot countersign
Forme en V-ing
I cannot be countersigning you cannot be countersigning he cannot be countersigning we cannot be countersigning you cannot be countersigning they cannot be countersigning
Perfect
I cannot have countersigned you cannot have countersigned he cannot have countersigned we cannot have countersigned you cannot have countersigned they cannot have countersigned
Perfect en V-ing
I cannot have been countersigning you cannot have been countersigning he cannot have been countersigning we cannot have been countersigning you cannot have been countersigning they cannot have been countersigning
Forme interrogative
Forme simple
can I countersign? can you countersign? can he countersign? can we countersign? can you countersign? can they countersign?
Forme en V-ing
can I be countersigning? can you be countersigning? can he be countersigning? can we be countersigning? can you be countersigning? can they be countersigning?
Perfect
can I have countersigned? can you have countersigned? can he have countersigned? can we have countersigned? can you have countersigned? can they have countersigned?
Perfect en V-ing
can I have been countersigning? can you have been countersigning? can he have been countersigning? can we have been countersigning? can you have been countersigning? can they have been countersigning?
Forme interro-négative
Forme simple
can I not countersign? can you not countersign? can he not countersign? can we not countersign? can you not countersign? can they not countersign?
Forme en V-ing
can I not be countersigning? can you not be countersigning? can he not be countersigning? can we not be countersigning? can you not be countersigning? can they not be countersigning?
Perfect
can I not have countersigned? can you not have countersigned? can he not have countersigned? can we not have countersigned? can you not have countersigned? can they not have countersigned?
Perfect en V-ing
can I not have been countersigning? can you not have been countersigning? can he not have been countersigning? can we not have been countersigning? can you not have been countersigning? can they not have been countersigning?