may countersign
Verbo regular: countersign - countersigned- countersigned

Afirmación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I may countersign
you may countersign
she may countersign
we may countersign
you may countersign
they may countersign 	I may be countersigning
you may be countersigning
she may be countersigning
we may be countersigning
you may be countersigning
they may be countersigning	I may have countersigned
you may have countersigned
she may have countersigned
we may have countersigned
you may have countersigned
they may have countersigned	I may have been countersigning
you may have been countersigning
she may have been countersigning
we may have been countersigning
you may have been countersigning
they may have been countersigning	

Negación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I may not countersign
you may not countersign
she may not countersign
we may not countersign
you may not countersign
they may not countersign 	I may not be countersigning
you may not be countersigning
she may not be countersigning
we may not be countersigning
you may not be countersigning
they may not be countersigning	I may not have countersigned
you may not have countersigned
she may not have countersigned
we may not have countersigned
you may not have countersigned
they may not have countersigned	I may not have been countersigning
you may not have been countersigning
she may not have been countersigning
we may not have been countersigning
you may not have been countersigning
they may not have been countersigning	

Forma interrogativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
may I countersign?
may you countersign?
may she countersign?
may we countersign?
may you countersign?
may they countersign? 	may I be countersigning?
may you be countersigning?
may she be countersigning?
may we be countersigning?
may you be countersigning?
may they be countersigning? 	may I have countersigned?
may you have countersigned?
may she have countersigned?
may we have countersigned?
may you have countersigned?
may they have countersigned? 	may I have been countersigning?
may you have been countersigning?
may she have been countersigning?
may we have been countersigning?
may you have been countersigning?
may they have been countersigning? 	

Forma interro-negativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
may I not countersign?
may you not countersign?
may she not countersign?
may we not countersign?
may you not countersign?
may they not countersign? 	may I not be countersigning?
may you not be countersigning?
may she not be countersigning?
may we not be countersigning?
may you not be countersigning?
may they not be countersigning? 	may I not have countersigned?
may you not have countersigned?
may she not have countersigned?
may we not have countersigned?
may you not have countersigned?
may they not have countersigned? 	may I not have been countersigning?
may you not have been countersigning?
may she not have been countersigning?
may we not have been countersigning?
may you not have been countersigning?
may they not have been countersigning?