I cannot tell when he will come, but when he comes, he will do his best.
彼がいつ来るかわからないが、来れば最善を尽くすだろう。
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I cannot tell when he will come, but when he comes, he will do his best.
彼がいつ来るかわからないが、来れば最善を尽くすだろう。
彼が何時来るか分からないが、彼は最善を尽くすだろう。