From direct speech to indirect speech

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00I have to complete a sentence listening to a story. 02br
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00Transcription: 01i00One of the travellers was worried. "Oh, I had a strange dream", he said. "A man was standing by my bed in the middle of the night like a ghost. He told me to wait: 'If you go on the sea tomorrow, you will be drowned', said this man in my dream".02i02br
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00Here’s the sentence I have to complete (I have highlighted the part written by me).02br
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01i00One of the travellers was worried because he had 01b00had a strange dream: a man who was standing by his bed in the middle of the night like a ghost told him to wait, because if he ………….. on the sea the day after, he ……………02b02i02br
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00I don’t know how to build the if clause. The verbs are of course 01i00to drown02i00 for the main clause and 01i00to go02i00 for the subordinate clause.02br
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