電話の電池が切れてしまいました。
- The phone’s battery has died.

電話の電池が切れてしまいました。 meaning: The phone battery has died. / My phone battery died.

The sentence follows a Subject-Object-Verb order in Japanese, although the subject is often implied. Let's break it down: ⚫︎ 電話の (denwa no) - The phone's (possessive particle) - This is the subject, though it doesn't appear directly in the sentence structure. It's implied by the topic marker "wa" that would be used if the phone was the sentence's topic. ⚫︎ 電池 (denchi) - battery ⚫︎ が (ga) - subject marker (indicates the subject of the sentence, specifically "battery") ⚫︎ 切れ (kire) - cut, run out (verb stem) ⚫︎ て (te) - connecting form of verb. ⚫︎ しまい (shimai) - (verb stem) ⚫︎ ました (mashita) - polite past tense of the auxiliary verb, expressing completion and often regret, "did" or "have done." ⚫︎ Therefore, the structure can be simplified as (Topic: Phone) + Subject(Battery) + Verb (to run out) + Auxiliary verb (to finish/complete) + Polite past tense

The particle が (ga) marks the subject of a sentence, specifically focusing on the new information or the specific thing being emphasized. ⚫︎ In this sentence, が marks 電池 (denchi - battery) as the subject. ⚫︎ The subject is what the sentence is about to describe or comment. ⚫︎ が emphasizes that it is the battery that has run out. ⚫︎ Unlike the topic marker は (wa), が introduces a new piece of information. ⚫︎ は (wa) would be used if the topic was the phone in general, for example, 電話は... (denwa wa...).

切れる (kireru) means "to run out," "to be cut," or "to die." It is a godan verb (Group 1 verb). Understanding its conjugation is key. ⚫︎ The stem 切れ (kire) is the -masu stem (the form you get before adding masu). ⚫︎ The original form is 切れる (kireru). ⚫︎ To change it into the "te" form, you use the "te" form conjugation. For godan verbs, the "te" form varies by how the last sound before "ru" changes: * In the case of 切れる (kireru), since the sound before "ru" is "e," you would change it to "e" + て (te) = 切れて (kirete).

しまう (shimau) is an auxiliary verb that adds a nuance of completion and often expresses a feeling of regret, or that something has happened unexpectedly or irreversibly. ⚫︎ It is used with the "-te" form of another verb, in this case, 切れて (kirete). ⚫︎ The combination 切れてしまいました (kirete shimaimashita) implies that the battery ran out completely, and the speaker may regret it or find it inconvenient. ⚫︎ しまう (shimau) conjugates like a normal verb. In this sentence, it's in the past tense, polite form しまいました (shimaimashita). ⚫︎ The basic form of しまう (shimau) is, for example: 食べてしまう (tabete shimau) - to eat up/ finish eating.

The phrase てしまいました (te shimaimashita) is a very common fixed expression. ⚫︎ It combines the "-te" form of a verb with the auxiliary verb しまう (shimau), in its past polite form. ⚫︎ It indicates that an action or event has been completed, often with the feeling of completion, or regret, or that it has happened unexpectedly. ⚫︎ Other examples include: * 忘れてしまいました (wasurete shimaimashita) - I have forgotten (and I regret it). * 食べてしまいました (tabete shimaimashita) - I ate (and I regret it). * 行ってしまいました (itte shimaimashita) - He/She has gone (and I feel... regretful/sad/it's already done).