nothing but, none other than
Noun +
This phrase is used to emphasize that something is absolutely nothing else but the stated reason, cause, or identity. It is a formal expression often used in writing or formal speech to provide a definitive explanation.
Noun
When used with a noun, it identifies the noun as the sole reason or identity of the subject.
事故の原因は人為的なミス
The cause of the accident was nothing but human error.
この結果は努力の結晶
This result is none other than the fruit of your hard work.
This expression is the formal equivalent of '〜にすぎない' or '〜以外のものではない'. It is very strong and assertive. Because it is a formal expression, it is rarely used in casual conversation.
Verb / Adjective + から
When used with a verb or an adjective, the phrase must be nominalized using 'から' to indicate a reason. This structure emphasizes that the specific reason provided is the only possible explanation.
Verb (Informal) + から
Used with the informal form of a verb followed by 'から' to emphasize a specific action as the sole cause.
彼が成功したのは、決して諦めなかったから
He succeeded simply because he never gave up.
Adjective + から
Used with い-adjectives or な-adjectives (with だ) followed by 'から' to emphasize a state or quality as the sole cause.
計画が失敗したのは、費用が高すぎたから
The plan failed simply because it was too expensive.
When expressing a reason, 'から' (meaning 'because') is inserted before '