Examples
wǒ我xiàng向guó qí国旗xuān shì宣誓xiào zhōng效忠。
我向国旗宣誓效忠。
I pledge allegiance to the flag.
下个月是他们的五十周年纪念，他们打算重新宣誓。
Next month is their 50th anniversary, and they're planning on renewing their vows.
骑士宣誓效忠于国王。
The knight swore an oath of allegiance to the king.