状態・変化N2
〜かけだ、〜かける
about to... / halfway through...
Structure
V-ます形（語幹）+ かける／かけだ／かけの
Explanation
Attached to the masu-stem of verbs, indicating an action that has just started or is half done. 〜かける means "about to start" or "halfway through"; 〜かけだ/〜かけのN describes an unfinished state. Common combinations: 食べかけ, 書きかけ, 死にかける.
Examples
何か言いかけて、やめた。
He started to say something, then stopped.
書きかけの手紙が机の上に置いてある。
A half-written letter is lying on the desk.
Note
This かける means "halfway"; don't confuse it with the かける of 電話をかける. Also used with nouns: 食べかけのケーキ.