could countersign
Verbo regolare: countersign - countersigned- countersigned

Affermazione 	
Forma semplice 	Forma con V-ing 	Perfetto 	Perfetto con V-ing 	
I could countersign
you could countersign
he could countersign
we could countersign
you could countersign
they could countersign 	I could be countersigning
you could be countersigning
he could be countersigning
we could be countersigning
you could be countersigning
they could be countersigning	I could have countersigned
you could have countersigned
he could have countersigned
we could have countersigned
you could have countersigned
they could have countersigned	I could have been countersigning
you could have been countersigning
he could have been countersigning
we could have been countersigning
you could have been countersigning
they could have been countersigning	

Negazione 	
Forma semplice 	Forma con V-ing 	Perfetto 	Perfetto con V-ing 	
I couldn't countersign
you couldn't countersign
he couldn't countersign
we couldn't countersign
you couldn't countersign
they couldn't countersign 	I couldn't be countersigning
you couldn't be countersigning
he couldn't be countersigning
we couldn't be countersigning
you couldn't be countersigning
they couldn't be countersigning	I couldn't have countersigned
you couldn't have countersigned
he couldn't have countersigned
we couldn't have countersigned
you couldn't have countersigned
they couldn't have countersigned	I couldn't have been countersigning
you couldn't have been countersigning
he couldn't have been countersigning
we couldn't have been countersigning
you couldn't have been countersigning
they couldn't have been countersigning	

Forma interrogativa 	
Forma semplice 	Forma con V-ing 	Perfetto 	Perfetto con V-ing 	
could I countersign?
could you countersign?
could he countersign?
could we countersign?
could you countersign?
could they countersign? 	could I be countersigning?
could you be countersigning?
could he be countersigning?
could we be countersigning?
could you be countersigning?
could they be countersigning? 	could I have countersigned?
could you have countersigned?
could he have countersigned?
could we have countersigned?
could you have countersigned?
could they have countersigned? 	could I have been countersigning?
could you have been countersigning?
could he have been countersigning?
could we have been countersigning?
could you have been countersigning?
could they have been countersigning? 	

Forma interro-negativa 	
Forma semplice 	Forma con V-ing 	Perfetto 	Perfetto con V-ing 	
couldn't I countersign?
couldn't you countersign?
couldn't he countersign?
couldn't we countersign?
couldn't you countersign?
couldn't they countersign? 	couldn't I be countersigning?
couldn't you be countersigning?
couldn't he be countersigning?
couldn't we be countersigning?
couldn't you be countersigning?
couldn't they be countersigning? 	couldn't I have countersigned?
couldn't you have countersigned?
couldn't he have countersigned?
couldn't we have countersigned?
couldn't you have countersigned?
couldn't they have countersigned? 	couldn't I have been countersigning?
couldn't you have been countersigning?
couldn't he have been countersigning?
couldn't we have been countersigning?
couldn't you have been countersigning?
couldn't they have been countersigning?