彼は休むことなく通勤している。
- He commutes without taking a day off.

彼は休むことなく通勤している。 meaning: He commutes to work without taking a break.

The sentence follows a typical Japanese Subject-Topic-Object-Verb (SOV) structure, although the subject can sometimes be implied. ⚫︎ 彼 (かれ) - He (subject). ⚫︎ は (wa) - Topic marker. ⚫︎ 休むことなく (やすむことなく) - Without taking a break (adverbial phrase). This modifies the verb. ⚫︎ 通勤している (つうきんしている) - Is commuting to work (verb phrase).

This is a fixed expression used to express that something happens continuously or without interruption. It's formed by taking the plain negative form (未然形 - mizenkei) of a verb and adding ことなく. ⚫︎ The plain negative form of 休む (やすむ - to rest) is 休まない (やすまない). ⚫︎ The expression 休むことなく (やすむことなく) literally means "without resting" or "without taking a break." ⚫︎ It's similar in meaning to using ないで (naide) but often carries a stronger sense of continuous action or determination. ⚫︎ This construction is very common in written Japanese and is an N1-level grammar point. ⚫︎ Other examples: * 彼は文句を言うことなく、一生懸命働いた。(かれはもんくをいうことなく、いっしょうけんめいはたらいた。) - He worked hard without complaining.

The verb している (shiteiru) is in the present continuous tense, indicating an action that is ongoing. ⚫︎ The base form of the verb is する (suru - to do). ⚫︎ The て (te)-form is して (shite). ⚫︎ Adding いる (iru - to be) to the て (te)-form creates the continuous tense: している (shiteiru). ⚫︎ The present continuous tense can also describe habits or repeated actions. ⚫︎ The tense marker いる (iru) conjugates to indicate tense (e.g. していた (shiteita) for past continuous or しているだろう (shiteirudarou) for future continuous).

は (wa) functions as a topic marker, indicating what the sentence is about. ⚫︎ In this sentence, は (wa) marks 彼 (かれ - he) as the topic. ⚫︎ The topic is what the speaker is primarily talking about. It's often, but not always, the subject. ⚫︎ The topic can be different from the subject. For example, the subject can be omitted if it is understood by context. ⚫︎ The choice of は (wa) over が (ga) (subject marker) often emphasizes a contrast or focuses on the topic itself.

The phrase 休むことなく (やすむことなく) acts as an adverbial phrase, modifying the verb 通勤している (tsuukin shiteiru - is commuting to work). ⚫︎ Adverbial phrases provide information about how, when, where, or why an action takes place. ⚫︎ In this case, 休むことなく (yasumu koto naku) describes the manner in which the subject is commuting. ⚫︎ The phrase indicates the action of commuting is continuous, without interruption or breaks. ⚫︎ Recognizing how phrases modify verbs is key to understanding complex sentence structures in Japanese.