兄は片付けないので部屋がゴミだらけです。
- My brother never cleans up, so his room is full of trash.

兄は片付けないので部屋がゴミだらけです。 meaning: My older brother doesn't clean up, so the room is full of trash.

⚫︎ The sentence follows a common Japanese sentence structure: Subject-Topic-Object-Verb, although the object is often omitted if it's clear from context. ⚫︎ The sentence pattern uses two clauses connected by the conjunction ので. The first clause describes the reason, and the second clause describes the result. This pattern is often used to explain causes and effects. ⚫︎ The first clause is 兄は片付けない which is a complete sentence itself. * 兄 (あに) - subject, meaning older brother * は - topic marker * 片付けない (かたづけない)- verb meaning "to not clean up". This is the negative form of the verb 片付ける (かたづける), "to clean up". * This is followed by the conjunction ので ⚫︎ The second clause is 部屋がゴミだらけです. * 部屋 (へや) - subject, meaning room * が - subject marker * ゴミだらけ- A noun phrase meaning "covered in trash/littered with trash" * です - polite copula "is/are" ⚫︎ The entire sentence can be broken down into two parts linked by the conjunction ので. The first part is the reason or cause, and the second part is the result or consequence.

⚫︎ は (topic marker) indicates the topic of the sentence. It introduces what the sentence is about. In this case, 兄 (my older brother) is the topic. ⚫︎ が (subject marker) marks the subject of a clause or a subordinate clause. In this sentence, が marks the subject of the second clause, which is 部屋 (the room). * 部屋が indicates that it is the room that is ゴミだらけ.

⚫︎ ので is a causal conjunction, meaning "because" or "since". It indicates the reason or cause for the situation described in the second clause. ⚫︎ ので is used at the end of a clause. ⚫︎ It is used to connect two clauses and show a cause-and-effect relationship. The clause before ので provides the reason, and the clause after ので states the result. ⚫︎ The choice between ので and から (another causal conjunction) depends on the context and the speaker's perspective. * ので often implies a more objective or less personal reason. * から can sometimes sound more direct or emphasize the speaker's personal feeling.

⚫︎ The verb 片付ける (かたづける), meaning "to clean up," is conjugated into the negative form 片付けない (かたづけない), meaning "doesn't clean up" or "will not clean up". ⚫︎ To form the negative form, you change the final vowel sound of the verb stem to the "-a" sound, and add ない. * 片付け is the verb stem. The final vowel "e" is changed to "a". So 片付か becomes the base form. * Adding ない to this becomes 片付けない. ⚫︎ This conjugation indicates the absence of the action (cleaning up) in the present or future.

⚫︎ だらけ is a suffix that turns a noun into an adjectival noun, meaning "covered in", "full of", "littered with," or "mostly" something undesirable. ⚫︎ In this sentence, ゴミ (trash) is combined with だらけ to form ゴミだらけ, meaning "covered in trash" or "full of trash." ⚫︎ Adjectival nouns behave differently from regular adjectives. They require the copula です (or other forms of the copula) to modify the noun. * For example: 部屋がゴミだらけだ (The room is covered in trash.) * だらけ does not change based on the noun it is used with. It is always だらけ