YOU SAID:

There will come a time when I no longer am

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私はもういないときが来るでしょう

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I will come when I am not

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私がいないときに私は来る

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I will come when I'm not

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いない時は来る

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When it does not come

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来ない場合

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If you do not come

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来ないのなら

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If it does not come

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来なければ

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If it does not come