～ことから
Reach a conclusion from a fact or feature
You’ll be able to give a fact or feature as the basis for a name, judgment, conclusion, or explanation.
白鳥が多く集まることから、この湖は「白鳥の湖」と呼ばれています。
hakuchou ga ooku atsumaru koto kara, kono mizuumi wa "hakuchou no mizuumi" to yobarete imasu.
What do you think this sentence means?
From the fact that many swans gather here, this lake is called "Swan Lake."
Use a fact as evidence
～ことから means “from the fact that” or “because.” It presents a fact or characteristic as the basis for a conclusion, explanation, name, or judgment.
玄関に知らないくつがあることから、だれかが来ているとわかりました。
genkan ni shiranai kutsu ga aru koto kara, dareka ga kite iru to wakarimashita.
From the unfamiliar shoes at the entrance, I knew someone was here.
道がぬれていることから、夜に雨が降ったようです。
michi ga nurete iru koto kara, yoru ni ame ga futta you desu.
Since the road is wet, it seems it rained during the night.
State the fact before the conclusion
Use a plain clause + ことから. The following part is often a conclusion, judgment, explanation, or name based on that fact.
顔色が悪いことから、彼は病気だと思われた。
kaoiro ga warui koto kara, kare wa byouki da to omowareta.
From his pale complexion, people thought he was ill.
服に猫の毛がたくさんついていたことから、彼が猫を飼っていると分かった。
fuku ni neko no ke ga takusan tsuite ita koto kara, kare ga neko o katte iru to wakatta.
From all the cat hair on his clothes, I could tell he had a cat.
窓ガラスが割れていたことから、警察は泥棒が窓から入ったと考えている。
madogarasu ga warete ita koto kara, keisatsu wa dorobou ga mado kara haitta to kangaete iru.
Since the window glass was broken, the police believe the thief came in through the window.
二人のテストの答えが間違いまで全部同じだったことから、先生は一人がもう一人の答えを写したと判断した。
futari no tesuto no kotae ga machigai made zenbu onaji datta koto kara, sensei wa hitori ga mou hitori no kotae o utsushita to handan shita.
Since the two students’ test answers were identical, even in their mistakes, the teacher judged that one had copied the other.
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