・That he will come [came] is certain.＝It is certain that he will come [came]. 彼が来る[来た]ことは確かだ (cf. it１ pron.

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・That he will come [came] is certain.＝It is certain that he will come [came]. 彼が来る[来た]ことは確かだ (cf. it^１ pron.🔗⭐🔉

・That he will come [came] is certain.＝It is certain that he will come [came]. 彼が来る[来た]ことは確かだ (cf. it^１ pron. 5).

研究社新英和大辞典ページ 228198 での【・That he will come [came] is certain.＝It is certain that he will come [came]. 彼が来る[来た]ことは確かだ (cf. it pron.】単語。