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verb + plaintively
plaintively 修饰动词时，可置于动词后，表明该动作带有悲哀或恳求的情绪。
She spoke plaintively about her lost dog.
她哀怨地谈起她丢失的狗。
悲哀地；哀怨地
先理解核心含义，再看它在真实句子里的用法。
悲哀地；哀怨地
in a plaintive manner; sadly; mournfully
She spoke plaintively about her lost dog.
她哀怨地谈起她丢失的狗。
以哀伤的方式
In a plaintive manner.
The little girl looked up at her mother and asked plaintively for another cookie.
小女孩抬头看着妈妈，哀怨地要求再吃一块饼干。
He sighed plaintively as he stared out the window at the rain.
他望着窗外的雨，悲哀地叹了口气。
"Why won't you play with me?" the dog whined plaintively.
“你为什么不和我玩？”狗哀怨地呜咽着。
plaintively 修饰动词时，可置于动词后，表明该动作带有悲哀或恳求的情绪。
She spoke plaintively about her lost dog.
她哀怨地谈起她丢失的狗。
plaintively 也可放在动词前，构成“副词 + 动词”结构，含义不变。
He plaintively asked whether they could leave early.
他哀怨地问他们能不能早点离开。
把 plaintively 放到句首并用逗号隔开，仍修饰整个句子的动作，语气更突出。
Plaintively, she sang the old song.
她哀怨地唱起了那首老歌。
Not this
She looked at me plaintive.
Use this
She looked at me plaintively.
修饰动词 look at 需要用副词 plaintively，而 plaintive 是形容词，只能修饰名词或作表语。
Not this
Please speak plaintively so I can understand you.
Use this
Please speak plainly so I can understand you.
plaintively 意为“哀怨地”，plainly 意为“清楚地/坦率地”；请求别人说清楚应用 plainly，二者形近但含义不同。
Focus on the distinctions below. Other candidates are kept compact until a reliable usage note is available.
悲哀地说
“Please don't leave me,” she said plaintively.
“请别离开我，”她悲哀地说。
哀怨地问
Why did you go without me? he asked plaintively.
“你为什么不带我去？”他哀怨地问。
哀伤地哭喊
The lost child cried plaintively for her mother.
走失的孩子哀伤地哭喊着找妈妈。
哀声恳求
He pleaded plaintively for one more chance.
他哀声恳求再给一次机会。
哀叹
She sighed plaintively as she closed the old photo album.
她合上旧相册，哀叹了一声。
Use plaintively naturally, then get feedback on meaning, tone, grammar, and phrasing.
Revisit a common error or keep this word in your review list.
把 plaintively 拆成 plaint（悲叹）加 -ly，plaint 本义就是哀叹，所以 plaintively 就是悲哀地、哀怨地。
语域：formal 常见场景：文学作品、正式叙述、书面描写 plaintively 多用于文学作品或较正式的书面叙述中，日常口语里不多见；口语中更常说 sadly 或 in a sad voice。
plaintively 的重音在第一音节 /pleɪn/，其后是 /tɪvli/；英语中几乎没有以 /eɪntɪvli/ 结尾的常见词，因此没有真正的完全押韵词。positively、sensitively、alternatively 仅与它共享末尾的 /tɪvli/，但重读元音完全不同，不能算押韵；faintly、quaintly 拼写相近，但读作 /ˈfeɪntli/、/ˈkweɪntli/，缺少 /ɪv/ 这个音节；pensively 结尾为 /sɪvli/，与 /tɪvli/ 相近但不相同，且词首读音差异较大。
Dictionary facts from ECDICT, WIKTIONARY.