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
仅仅；刚刚；勉强；大概不会。；肯定不,几乎不。；几乎不；仅仅；差一点。
hardly at all; almost not
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。
用法提示：scarcely 作为副词，与 could 连用表示“几乎不”，加强否定语气。
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。
用法提示：scarcely...when... 结构表示“刚...就...”，scarcely 位于过去完成时中。
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。
用法提示：scarcely 修饰名词短语 a cloud，表示“几乎没有”。
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。
barely 更强调刚刚达到，语气比 scarcely 稍弱
hardly 与 scarcely 常可互换，但 hardly 更强调困难或否定
only just 仅用于时间上的‘刚刚’，不能用于‘几乎不’的否定意义
grammar · medium
易错句子I scarcely don't know him.
正确表达I scarcely know him.
Scarcely本身已包含否定含义，不可再与否定词连用。
grammar · medium
易错句子There were scarcely students.
正确表达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。
hardly强调数量少或程度低，常与情态动词连用；scarcely更强调几乎不存在或不够
barely强调勉强够或差一点；scarcely强调几乎达不到
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。
常与scarcely搭配表示数量或程度上的不足
强调稀缺，与scarcely的否定含义相关
描述数量或程度不够，与scarcely连用表示几乎达不到所需
表示最低限度，与scarcely共现时强调少到几乎没有
强调范围或数量不大，常与scarcely一起表达稀少
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！
Dictionary facts from ECDICT, WIKTIONARY.