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 can't countersign you can't countersign he can't countersign we can't countersign you can't countersign they can't countersign
Forme en V-ing
I can't be countersigning you can't be countersigning he can't be countersigning we can't be countersigning you can't be countersigning they can't be countersigning
Perfect
I can't have countersigned you can't have countersigned he can't have countersigned we can't have countersigned you can't have countersigned they can't have countersigned
Perfect en V-ing
I can't have been countersigning you can't have been countersigning he can't have been countersigning we can't have been countersigning you can't have been countersigning they can't 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't I countersign? can't you countersign? can't he countersign? can't we countersign? can't you countersign? can't they countersign?
Forme en V-ing
can't I be countersigning? can't you be countersigning? can't he be countersigning? can't we be countersigning? can't you be countersigning? can't they be countersigning?
Perfect
can't I have countersigned? can't you have countersigned? can't he have countersigned? can't we have countersigned? can't you have countersigned? can't they have countersigned?
Perfect en V-ing
can't I have been countersigning? can't you have been countersigning? can't he have been countersigning? can't we have been countersigning? can't you have been countersigning? can't they have been countersigning?