scarcely

Compared meaning: almost not, hardly at all (adverb).

比较义项：几乎不，几乎没有（副词）。

• barely

  Barely stresses a very narrow margin — something happened, but only just; it pairs naturally with achievement verbs like pass, survive, or afford, unlike hardly or scarcely.

  barely强调差一点点就没能做到——事情发生了，但只是勉强做到；常与pass（通过）、survive（幸存）、afford（负担得起）等表示“达成”的动词搭配，这点和hardly、scarcely不同。

  She barely passed the driving test, missing a perfect score by one point.

  她驾照考试只是勉强通过，只差一分就能得满分。

• hardly

  Hardly is the everyday, neutral choice, most common in speech; it combines naturally with can/could and with ever to mean almost never.

  hardly是最常见、最中性的日常用词，口语中最为常用；常与can、could连用，也常与ever搭配表示“几乎从不”。

  He hardly ever calls his parents now that he lives abroad.

  他现在住在国外，几乎从不给父母打电话了。

• scarcely 本词

  Scarcely is formal and rather literary, common in written English; it is often placed first for dramatic effect, which forces inverted word order.

  scarcely是正式、书面色彩较浓的词，常见于书面英语；常放在句首加强语气，句子随之使用倒装语序。

  Scarcely had the meeting started when the fire alarm went off.

  会议刚开始，火警警报就响了。

Barely, hardly, and scarcely all mean almost not, but tone and style differ. Barely stresses a narrow, just-achieved margin. Hardly is the most common word in speech, often with can or could. Scarcely is formal and literary, often starting a sentence with inverted word order.

barely、hardly、scarcely在“几乎不”这层意思上很接近，但语气和文体不同：barely强调“勉强达成”的窄幅差距，hardly是口语中最常用、最中性的说法，scarcely则更正式、书面化，常用于倒装句式。

Compared meaning: almost no time between two events (adverb).

比较义项：某事发生后几乎立刻、几乎没有间隔（副词）。

• barely

  More common in everyday speech and writing; states the short gap between two events plainly, without extra formality.

  更口语化，日常说话和写作中更常见；平实地陈述两件事之间的短暂间隔，不带额外的正式感。

  I had barely sat down when my phone started ringing.

  我刚坐下，手机就响了起来。

• scarcely 本词

  More formal and literary; often opens a sentence with inverted word order (Scarcely had... when...) for dramatic emphasis.

  更正式、更书面；常用倒装句式开头（Scarcely had... when...）来制造戏剧性的强调效果。

  Scarcely had the lights gone out when the audience began to applaud.

  灯刚一熄灭，观众就开始鼓掌了。

Barely and scarcely show almost no time between two events, often as 'had barely/scarcely... when...'. Barely is common in speech. Scarcely is more formal, often with inverted word order. Barely's meaning of a small amount, and scarcely's meaning of almost not, are not compared here.

这两个词在此义项上很接近，都强调两件事之间几乎没有时间差，常用于“had barely/scarcely...when...”句型；scarcely 语气更正式、更书面，常用倒装结构来强调，barely 更口语、更常用。这里不比较 barely 表示“几乎不够”（数量）的用法，也不比较 scarcely 表示“几乎不”（程度）的用法。