Note
Sometimes the initial t-sound changes into a d-sound due to rendaku, a phenomenon where the initial consonant of the second part of a compound word becomes voiced.
Unfortunately, there are no clear rules for when rendaku applies.
Usages of 〜chuu
電気 ストーブ で 部屋中 に 熱 が 広がった。denki sutoobu de heyajuu ni netsu ga hirogatta.
Heat was spread throughout the room by the electric stove.
https://tatoeba.org/eng/sentences/show/124854
この ウイルス は 空気中 で 広がります。kono uirusu wa kuukichuu de hirogarimasu.
This virus spreads through the air.
旅行中 に たくさん の 写真 を 撮りました。ryokouchuu ni takusan no shashin o torimashita.
I took a lot of photos during the trip.
彼女 は いつも 授業中 に メモして いる。kanojo wa itsumo jugyouchuu ni memoshite iru.
She always takes notes during class.
散歩中 に 美しい 花々 を 見つけました。sanpochuu ni utsukushii hanabana o mitsukemashita.
I found beautiful flowers while walking.
入院中 は たくさん の 本 を 読みました。nyuuinchuu wa takusan no hon o yomimashita.
I read a lot of books during my hospitalization.
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“How do verb conjugations work in Japanese?”
Japanese verbs conjugate based on tense, politeness, and mood. For example, the polite present form adds ‑ます to the verb stem, while the past tense uses ‑ました. Unlike English, Japanese verbs don't change based on the subject — the same form works for "I", "you", and "they".
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