文法上的疑問形式
這一組都在講「形式」：句子怎麼排、用哪個字，才算是在發問。三個意思的差別只在指的範圍大小。
adjective · C1
In grammar, an interrogative word or sentence asks a question, or is built in the shape of a question. 'Who' and 'what', for example, are interrogative pronouns.
疑問的
核心畫面
Think of the small turn a sentence makes when it stops telling and starts asking. 'He is ready' is flat and finished. 'Is he ready?' leans forward and waits for someone else to fill the gap. Interrogative is the label English puts on anything wearing that forward-leaning shape: a whole sentence, a single word like 'who' or 'what', and, in written English, even a face or a voice that waits for an answer without asking out loud.
可以想成一個句子轉了個方向：本來是平平地把一件事說完，現在整句往前傾，等著別人接話。He is ready 是說完了…更多收起
可以想成一個句子轉了個方向：本來是平平地把一件事說完，現在整句往前傾，等著別人接話。He is ready 是說完了；Is he ready? 是還沒完，在等人回答。interrogative 這個標籤貼的，就是這個「等回答」的姿態。它可能貼在整個句型上，可能貼在 who、what 這種字上。在書面英文裡，也可能貼在一個什麼都沒說、卻等著你解釋的眼神上。From the word’s history
Wiktionary records the word as coming from Late Latin interrogativus, equivalent to interrogate plus the adjective ending -ive — literally 'to do with asking'. Every modern use still sits on that one job.
Wiktionary 記載 interrogative 來自晚期拉丁文 interrogātīvus，等於 interrogate（盤問、提問）加上形容詞字尾 -ive，字面就是「跟發問有關的」。今天的每一個用法都還踩在這個工作上：不管貼在句子、單字還是眼神上，被貼上的那個東西都在發問。
Wiktionary entry 'interrogative' (packet source_ref kaikki:3f6f69a190036ae4:1188273240:14431): 'From Late Latin interrogātīvus, equivalent to interrogate + -ive.'
Two branches
沒說出口的疑問：眼神與語氣
同樣是那個「等回答」的姿態，只是換到人身上：問句沒有說出口，是表情和聲音在問。
adjective · C1
An interrogative look, voice or tone shows that the person wants an answer, even when no question has actually been spoken.
探詢的；帶著疑問的