・The ship is building. 《まれ》船は建造中だ (cf. be１ auxil. v. 1) ＝The ship is

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・The ship is building. 《まれ》船は建造中だ (cf. be^１ auxil. v. 1) ＝The ship is 🔗⭐🔉

・The ship is building. 《まれ》船は建造中だ (cf. be^１ auxil. v. 1) ＝The ship is being built.

研究社新英和大辞典ページ 176262 での【cf. be auxil. v. 1】単語。