Answers

副詞節を形成するwhen,ifは原則willを伴いません
Ex.You can use the computer <if it is available>.
一方、名詞節を形成するwhen,ifはwillを伴います
Ex.I don't know [when he will go to the library].
この原則に従えば右側の問題も解けることかと思います

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