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