外國友人結婚時用英語送什么祝福

外國友人結婚時，可以用英語送以下祝福：

1. "May your marriage be filled with joy, love, and happiness. May your union be blessed with many years of happiness and fulfillment."
2. "Congratulations on your wedding! May your marriage be filled with love, understanding, and respect."
3. "May this marriage be a symbol of your love for each other and a symbol of the love you have for life."
4. "May your union bring joy and happiness to you both today and in the years to come."
5. "Wishing you a lifetime of love and happiness together. May your marriage be filled with laughter and joy."
6. "May your marriage be filled with warmth, understanding, and a deep sense of commitment."
7. "Congratulations on this wonderful day, and may your marriage be filled with the joy of companionship and the comfort of each other's presence."

以上都是可以的，關鍵是真誠的祝福對方在婚姻生活中幸福美滿。