だとif it's the case

明日(あした)が雨(あめ)だと傘(かさ)が必要(ひつよう)になります。

If it's the case that it will rain tomorrow, you will need an umbrella. {if it's the case}

刑事(けいじ)：「この証拠(しょうこ)がでっちあげだと我々(われわれ)は不利(ふり)になる…。」

Detective: "If it's the case that this evidence is fabricated, we would be at a disadvantage..." {if it's the case}

独(ひと)り言(ごと)：「来週(らいしゅう)の月曜日(げつようび)も祝日(しゅくじつ)だと三(さん)連休(れんきゅう)になるのになぁ〜。」

Monologue: "If it's the case that next Monday is a holiday, we would have a three-day weekend." {if it's the case}

有名(ゆうめい)な研究(けんきゅう)者(しゃ)であれ、半(はん)世紀(せいき)前(まえ)だとこの理論(りろん)は世間(せけん)に受(う)け入(い)れられないだろう。

Even if it's the case of a famous researcher, this theory would probably not have been accepted by the public half a century ago. {if it's the case}

監督(かんとく)：「あの涙(なみだ)が演技(えんぎ)だと、彼(かれ)は才能(さいのう)のある役者(やくしゃ)だ。ぜひスカウトさせてもらおう！」

Director: "If it's the case that those tears were acting, he is a talented actor. I definitely want to scout him!" {if it's the case}