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scarcely ... when ...
scarcely...when 结构常用倒装，即 scarcely 后接 had + 主语 + 过去分词，when 从句用一般过去时。
Scarcely had I closed the door when the phone rang.
我刚关上门，电话就响了。
几乎不；简直不
先理解核心含义，再看它在真实句子里的用法。
几乎不；简直不
hardly at all; almost not
Scarcely had I closed the door when the phone rang.
我刚关上门，电话就响了。
大概不会。
Probably not.
肯定不,几乎不。
Certainly not, hardly at all.
几乎不；仅仅；差一点。
Hardly: only just; by a small margin.
I could scarcely believe my eyes when I saw the surprise party.
看到惊喜派对时，我几乎不敢相信自己的眼睛。
She had scarcely finished her speech when the audience burst into applause.
她刚一结束演讲，观众就爆发出掌声。
There was scarcely a cloud in the sky that summer morning.
那个夏天的早晨，天空中几乎没有一丝云彩。
scarcely...when 结构常用倒装，即 scarcely 后接 had + 主语 + 过去分词，when 从句用一般过去时。
Scarcely had I closed the door when the phone rang.
我刚关上门，电话就响了。
I could scarcely believe my eyes.
我几乎不敢相信自己的眼睛。
There was scarcely any food left.
几乎没剩下什么食物。
He scarcely ever goes out.
他几乎从不出门。
Not this
I scarcely don't know him.
Use this
I scarcely know him.
Scarcely本身已包含否定含义，不可再与否定词连用。
Not this
There were scarcely students.
Use this
There were scarcely any students.
Scarcely是副词，不能直接修饰名词，需借助限定词如any。
Focus on the distinctions below. Other candidates are kept compact until a reliable usage note is available.
几乎没有
There was scarcely any food left after the party.
聚会后几乎没剩下什么食物。
几乎从不
She scarcely ever goes out after dark.
她天黑后几乎从不外出。
刚……就……
Scarcely had he arrived when trouble started.
他刚一到，麻烦就开始了。
几乎不敢相信
I could scarcely believe my eyes when I saw the result.
看到结果时，我几乎不敢相信自己的眼睛。
几乎察觉不到
The difference in color was scarcely noticeable.
颜色上的差异几乎察觉不到。
几乎没有（一个）
There was scarcely a person in the street at that hour.
在那个时辰，街上几乎空无一人。
刚……就……
Scarcely had she entered the room when the phone rang.
她刚进房间，电话就响了。
几乎没有
There was scarcely any food left after the party.
派对之后几乎没有食物剩下。
几乎从不
He scarcely ever goes to the cinema.
他几乎从不看电影。
我几乎等不及想和你在一起！
I can scarcely wait to be with you!
我几乎等不及想和你在一起！
Use scarcely naturally, then get feedback on meaning, tone, grammar, and phrasing.
Revisit a common error or keep this word in your review list.
联想scar（伤疤）很少见，所以scarcely意为“几乎不”。
常见场景：formal writing、everyday conversation scarcely 多用于正式或文学语境，也可见于日常口语，但相对较少。
常与any, ever等连用，表示“几乎不”。
Dictionary facts from ECDICT, WIKTIONARY.