mantuvierais
Imperfecto de subjuntivo para el sujeto vosotros del verbo mantener.

mantener

Os dije que os mantuvierais al margen.
I told you two to stay out of it.
¡Os dije que os mantuvierais al margen!
I told you guys to stay out of it!
Os dije que os mantuvierais alejados de la parte de delante de la tienda.
Told you to stay away from the front of the store.
No. Os dije que os mantuvierais al margen.
I told you to stay out of it.
Os dije que os mantuvierais alejados.
Told you to stay away.
Palabra del día
el relleno