だろう
コンピューターがなければ、現在の世界は存在しないだろう。
Without computers, the modern world would not exist.
彼女が歌っているのを聞くなら、プロだとわかるだろう。
To hear her sing, you would think she is a professional.
10年前だったら、そんな手術は不可能だったろう。
If it had been ten years ago, such an operation would have been impossible.
Johnは信頼のおける人だった、そうでなければ、彼に助けは求めなかったろう。
John was a reliable person; otherwise, we wouldn't have asked him for help.
コーヒーがなければ、スターバックスは存在しないだろう。
Without coffee, Starbucks would not exist.
もし本当の友人なら。そんなことは言わないだろう。
If you were a true friend, you would never say such a thing.
もし去年だったら、あの冗談は面白かっただろう。
If it had been last year, that joke would have been funny.
この映画は面白い。そうでなければ、12回も観たりしない。
This movie is interesting. Otherwise, I wouldn't have watched it twelve times.
もし去年の失敗がなければ、今の成功はないだろう。
Without last year's failure, there would be no success today.
彼の本を読むなら、天才だとわかるだろう。
If you read his book, you would think he is a genius.
もしあの時、私がリーダーだったら、違う決断をしただろう。
If I had been the leader at that time, I would have made a different decision.
今日は信号が全部青だった。そうでなければ、遅刻していたところだ。
Today, every traffic light was green. Otherwise, I would have been late.