この大会は年齢を問わず誰でも参加できる。
- Anyone can participate in this tournament regardless of age.

この大会は年齢を問わず誰でも参加できる。 meaning: Anyone can participate in this tournament regardless of age.

⚫︎ This pattern means regardless of or irrespective of. ⚫︎ It is formed by attaching を問わず directly to a noun. ⚫︎ In this sentence, 年齢を問わず means regardless of age. ⚫︎ It indicates that a certain rule or condition applies to everyone without exception. ⚫︎ This is a frequent grammar point in the JLPT N2 level.

⚫︎ This pattern means anyone, anywhere, anything, or anytime. ⚫︎ It is formed by combining an interrogative word such as 誰 (who), どこ (where), or 何 (what) with the particle でも. ⚫︎ In this sentence, 誰でも means anyone or anybody. ⚫︎ It emphasizes that there are no restrictions on the subjects who can do the action. ⚫︎ The particle が or は is usually omitted after 誰でも when it acts as the subject.

⚫︎ The potential form expresses the ability or possibility to do something, corresponding to can in English. ⚫︎ The verb in this sentence is 参加できる (can participate), which is the potential form of the Ichidan verb 参加する (to participate). ⚫︎ For Ichidan verbs, the potential form is created by changing the final る to られる (or れる in informal/modern speech). ⚫︎ In potential sentences, the direct object marker を is often replaced by the particle が, though は is also used for contrast or emphasis as seen in 誰でも参加できる. ⚫︎ Recognizing verb conjugations is essential for mastering intermediate Japanese.

⚫︎ The particle は functions as a topic marker in Japanese sentences. ⚫︎ It marks the overall theme or topic that the sentence is about. ⚫︎ In this sentence, この大会は establishes this tournament as the main topic of the entire statement. ⚫︎ It tells the listener what or whom the sentence will explain next. ⚫︎ The predicate that follows describes a characteristic or action regarding this topic.

⚫︎ The word この is a demonstrative determiner meaning this. ⚫︎ It always directly modifies a following noun without standing alone. ⚫︎ In this sentence, この attaches to the noun 大会 (tournament/competition) to specify this tournament. ⚫︎ It points to something close to the speaker or something previously mentioned in the context. ⚫︎ It belongs to the Kosoado system of Japanese demonstratives.