should countersign
Verbo regular: countersign - countersigned- countersigned

Afirmação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I should countersign
you should countersign
he should countersign
we should countersign
you should countersign
they should countersign 	I should be countersigning
you should be countersigning
he should be countersigning
we should be countersigning
you should be countersigning
they should be countersigning	I should have countersigned
you should have countersigned
he should have countersigned
we should have countersigned
you should have countersigned
they should have countersigned	I should have been countersigning
you should have been countersigning
he should have been countersigning
we should have been countersigning
you should have been countersigning
they should have been countersigning	

Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I should not countersign
you should not countersign
he should not countersign
we should not countersign
you should not countersign
they should not countersign 	I should not be countersigning
you should not be countersigning
he should not be countersigning
we should not be countersigning
you should not be countersigning
they should not be countersigning	I should not have countersigned
you should not have countersigned
he should not have countersigned
we should not have countersigned
you should not have countersigned
they should not have countersigned	I should not have been countersigning
you should not have been countersigning
he should not have been countersigning
we should not have been countersigning
you should not have been countersigning
they should not have been countersigning	

Forma interrogativa 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
should I countersign?
should you countersign?
should he countersign?
should we countersign?
should you countersign?
should they countersign? 	should I be countersigning?
should you be countersigning?
should he be countersigning?
should we be countersigning?
should you be countersigning?
should they be countersigning? 	should I have countersigned?
should you have countersigned?
should he have countersigned?
should we have countersigned?
should you have countersigned?
should they have countersigned? 	should I have been countersigning?
should you have been countersigning?
should he have been countersigning?
should we have been countersigning?
should you have been countersigning?
should they have been countersigning? 	

Forma interro-Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
should I not countersign?
should you not countersign?
should he not countersign?
should we not countersign?
should you not countersign?
should they not countersign? 	should I not be countersigning?
should you not be countersigning?
should he not be countersigning?
should we not be countersigning?
should you not be countersigning?
should they not be countersigning? 	should I not have countersigned?
should you not have countersigned?
should he not have countersigned?
should we not have countersigned?
should you not have countersigned?
should they not have countersigned? 	should I not have been countersigning?
should you not have been countersigning?
should he not have been countersigning?
should we not have been countersigning?
should you not have been countersigning?
should they not have been countersigning?