你送我这么贵重的礼物，太破费了。
You shouldn't have bought me such an expensive gift.
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shouldn't英 /ˈʃʊdnt/|美 /ˈʃʊdnt/
解释
shouldn't have 在此是礼貌用语而非建议/禁止。它表示对方"本不必"如此破费，是接受礼物时表达感谢和谦让的固定说法。have 是完成体标记，与过去分词 bought 构成"本已做某事"的含义。
You shouldn't have bought me such an expensive gift.
shouldn't have 在此是礼貌用语而非建议/禁止。它表示对方"本不必"如此破费，是接受礼物时表达感谢和谦让的固定说法。have 是完成体标记，与过去分词 bought 构成"本已做某事"的含义。