我们本可以去海边度假的，但机票价格太贵了。
We could have gone to the beach for vacation, but the flights were too expensive.
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Could英 /kʊd/|美 /kʊd/
gone英 /ɡɒn/|美 /ɡɔn/
解释
could + have + gone 表示过去有可能去海边但实际没去，could 情态动词表过去可能性，have gone 为完成不定式表示未实现的过去动作
We could have gone to the beach for vacation, but the flights were too expensive.
could + have + gone 表示过去有可能去海边但实际没去，could 情态动词表过去可能性，have gone 为完成不定式表示未实现的过去动作