结婚英语常用短语有：

tie the knot: 此短语来源于结婚仪式中将新人的手绑在一起的做法，意为“结婚”。
Example: They decided to tie the knot after five years of dating.
翻译：他们在约会5年后决定结婚。

walk down the aisle: 此短语源自新娘走过教堂的通道，意为“步入礼堂结婚”。
Example: She felt nervous as she walked down the aisle to meet her groom.
翻译：她走过礼堂去见新郎，感到有点紧张。

say "I do": 此短语是结婚仪式中，新人对着传统问题回答“我愿意”的惯用说法，意为“答应结婚”。
Example: The couple looked into each other's eyes and said "I do."
翻译：这对夫妇相视而笑，说出“我愿意”。

exchange vows: 此短语指的是新人在结婚仪式上交换誓词，意为“交换结婚誓词”。
Example: They exchanged vows in front of their family and friends.
翻译：他们在家人和朋友面前交换了结婚誓词。