We have not heard of a disney cruise.这里have为构成现在完成时态的助动词,所以直接在其后加not.现在完成时的结构：have done(动词的过去分词).如果have 为实意动词翻译成“有”,此时,句子变成否定句要在have 前加 don't
we have heard of a disney cruise改为否定句
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