nagai monogatari wo yonda.

In Japanese, adjectives usually come before the noun they describe, just like in English.

• 長い物語 = a long story

Here, 長い is directly modifying 物語.

This is the normal pattern:

• 小さい犬 = a small dog
• 古い家 = an old house
• 面白い本 = an interesting book

So 長い物語 is simply the standard Japanese way to say long story.

Because 長い is an い-adjective.

Japanese adjectives are often divided into two major types:

• い-adjectives
• な-adjectives

長い belongs to the first type, so it naturally ends in い when it comes before a noun:

• 長い物語

A な-adjective would need な before a noun, but 長い is not that kind of adjective.

For example:

• 静かな部屋 = a quiet room
• 有名な人 = a famous person

But:

• 長い道 = a long road
• 新しい本 = a new book

を marks the direct object of the verb. In other words, it shows what was read.

So in:

• 長い物語を読んだ

the thing being read is:

• 長い物語 = the long story

You can think of を as showing what received the action of the verb.

Examples:

• 本を読む = read a book
• 映画を見る = watch a movie
• 水を飲む = drink water

In this sentence, を tells you that the long story is the thing that was read.

Because Japanese normally places the main verb at the end of the sentence.

This is one of the biggest word-order differences between English and Japanese.

English:

• I read a long story.

Japanese:

• (I) long story + object marker + read
• 長い物語を読んだ。

A very common basic Japanese sentence pattern is:

• [topic/subject] [object] を [verb]

So having 読んだ at the end is exactly what you would expect in Japanese.

This is because 読む is a godan verb, and its past form changes in a specific way.

For verbs ending in -む, -ぶ, or -ぬ, the plain past usually becomes -んだ.

So:

• 読む → 読んだ
• 飲む → 飲んだ
• 遊ぶ → 遊んだ
• 死ぬ → 死んだ

This is a normal conjugation pattern, even though it may not look obvious at first.

So 読んだ is just the plain past form of 読む.

It is pronounced yonda.

The reason it is not yomuta is that Japanese verb conjugation often involves sound changes, not just adding one ending mechanically.

For 読む:

• dictionary form: よむ
• past plain form: よんだ

The む changes as part of the conjugation pattern, giving:

• む → んだ

So you should learn this as a standard pattern:

• 読む → 読んだ
• 飲む → 飲んだ

This kind of change is very common in Japanese verbs.

That is just how this particle works in modern Japanese.

• It is written as を
• It is usually pronounced as お

So:

• 長い物語を読んだ is pronounced roughly:
• ながい ものがたり お よんだ

In modern standard Japanese, the object particle を is normally pronounced the same as お, even though the spelling is different.

The subject is simply omitted.

Japanese often leaves out information that is understood from context. If it is already clear who did the action, the speaker usually does not say it.

So 長い物語を読んだ。 could mean:

• I read a long story.
• He read a long story.
• She read a long story.
• They read a long story.

The exact subject depends on the situation.

This is extremely normal in Japanese. A full sentence does not always need an explicit subject.

No. Japanese is usually written without spaces.

So this sentence would normally appear as:

• 長い物語を読んだ。

The spaces are often added in teaching materials to make the parts easier to see:

• 長い / 物語 / を / 読んだ

So the spaced version is helpful for learners, but it is not the normal way Japanese is written in everyday text.

Yes, but it means something slightly different in structure and focus.

• 長い物語 = a long story
  • Here, 長い directly modifies 物語
• 物語が長い = the story is long
  • Here, 長い is the predicate of the sentence

So:

• 長い物語を読んだ = read a long story
• 物語が長い = the story is long

Both are correct, but they are doing different grammatical jobs.

No. 読んだ is the plain past form.

The polite past form would be:

• 読みました

So:

• 長い物語を読んだ。 = plain / casual
• 長い物語を読みました。 = polite

The plain form is very common in casual conversation, diary-style writing, stories, and informal speech. The polite form is used when speaking more formally or politely.