今回のテーマは前置詞のuntilです。次の各文のうち，untilの使い方が間違っているのはどれでしょう？
(1) He didn’t come home until 7:00 p.m.
(2) He came home until 7:00 p.m.
(3) We shall have to wait here until help arrives.
(4) I walked until the river.
(5) They had to get up every morning until 7:00 a.m.
(by Prof. Atsunori Okuba)
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