よ – Adding Friendly Emphasis in Japanese [JLPT N5]

Quick Summary

Meaning: The sentence-ending particle よ adds light emphasis. It shows new information, your strong opinion, or friendly insistence, like “you know,” “I’m telling you,” or “for sure.”

How to Use: Simply add よ at the end of a normal sentence (after verbs, adjectives, or nouns).

Example:

• その宇宙人は日本語が上手ですよ。
• Sono uchuujin wa Nihongo ga jouzu desu yo.
• That alien is good at Japanese, you know.

Overview

The particle よ is a very common sentence-ending particle in Japanese. You put it at the end of a sentence to add a feeling of emphasis or assertion. It tells the listener, “I’m giving you this information,” or “Listen, this is what I think.”

In English, it is often similar to:

• “you know”
• “I’m telling you”
• “for sure” or “definitely”
• lightly “!” at the end of the sentence

Use よ when:

• You think the other person doesn’t know something. (You give them new information.)
• You want to show your strong opinion or confidence.
• You want to sound a bit more friendly, lively, or encouraging.

Some simple ideas:

• Without よ: neutral statement, just information.
• With よ: “By the way, I’m telling you this,” or “Really, believe me.”

Compare these two:

• 今日はテストがありません。
• Kyou wa tesuto ga arimasen.
• There is no test today.

• 今日はテストがありませんよ。
• Kyou wa tesuto ga arimasen yo.
• There is no test today, you know. / There’s really no test today.

The meaning (no test) is the same, but the feeling is different. The sentence with よ sounds more like you are reassuring a worried friend.

Because it is just a small nuance word, beginners often skip it. But using よ correctly makes your Japanese sound much more natural and friendly.

Structure / Formation

Basic Pattern

The good news: the structure is very simple. You take a normal sentence, and put よ at the end.

• V + よ
• i-adj + よ
• na-adj + だ + よ (plain) / na-adj + です + よ (polite)
• N + だ + よ (plain) / N + です + よ (polite)

Here, V can be any verb form (V-る, V-た, V-ている, V-ない, etc.). You don’t change the verb for よ. You just add よ at the very end.

Pattern Examples

Here are some core patterns with short, quirky examples to show how よ works in real sentences.

Pattern	Example (Japanese)	Romaji	Meaning
V (dictionary) + よ	私の犬はギターを弾くよ。	Watashi no inu wa gitā o hiku yo.	My dog plays the guitar, you know.
V-ている + よ	おじいさんは今ゲームをしているよ。	Ojiisan wa ima gēmu o shite iru yo.	Grandpa is playing video games now, you know.
i-adj + よ	このロボットはとてもやさしいよ。	Kono robotto wa totemo yasashii yo.	This robot is really kind, you know.
na-adj + です + よ	先生はアイドルみたいで有名ですよ。	Sensei wa aidoru mitai de yuumei desu yo.	Our teacher is famous like an idol, you know.
N + です + よ	このトイレは図書館の中ですよ。	Kono toire wa toshokan no naka desu yo.	This toilet is inside the library, you know.

Using よ with Polite vs. Plain Speech

You can add よ to both polite and plain sentences.

• Polite: V-ます + よ / N + です + よ / na-adj + です + よ
• Plain: V (plain) + よ / N + だ + よ / na-adj + だ + よ

Polite examples:

• 先生、宇宙人は来ますよ。
• Sensei, uchuujin wa kimasu yo.
• Teacher, the aliens are coming, you know.

• このカレーは甘いですよ。
• Kono karē wa amai desu yo.
• This curry is sweet, you know.

Plain examples:

• もう宿題は終わったよ。
• Mou shukudai wa owatta yo.
• I already finished my homework, you know.

• あれは私の忍者ロボットだよ。
• Are wa watashi no ninja robotto da yo.
• That is my ninja robot, you know.

With friends and family, you will often hear the plain + よ pattern. With teachers, customers, or in formal situations, use the polite + です / ます + よ pattern.

Nuance Tips for Beginners

Here are some simple rules to keep your usage natural:

• Use よ when you think the listener doesn’t know or is not sure.
  • Example:
    • あのパンダは校長先生ですよ。
    • Ano panda wa kouchou sensei desu yo.
    • That panda is the principal, you know.
• If the listener already knows very well, using よ can sound like you are correcting them or being a bit strong.
• Saying a sentence without よ is never wrong. If you are unsure, you can simply leave it out.

As you hear more Japanese, you will notice that よ often appears together with other sentence-ending particles like ね (for agreement), for example よね. For now, focus on simple … よ sentences and the feeling of “I’m telling you this” or “for sure.”

Example Sentences

• あのドラゴンは英語の先生ですよ。
• Ano doragon wa Eigo no sensei desu yo.
• That dragon is an English teacher, you know.

• 今夜、月でパーティーがありますよ。
• Konya, tsuki de pātī ga arimasu yo.
• Tonight, there’s a party on the moon, you know.

• 私の冷蔵庫は毎朝ジョギングするよ。
• Watashi no reizōko wa mai asa jogingu suru yo.
• My refrigerator goes jogging every morning, you know.

• このカエルはとてもシャイなんだよ。
• Kono kaeru wa totemo shai nan da yo.
• This frog is really shy, you know.

• 教室の後ろは秘密の図書館なんですよ。
• Kyoushitsu no ushiro wa himitsu no toshokan nan desu yo.
• Behind the classroom is a secret library, you know.

Quick Practice

(Answers and explanations are right under this section.)

Multiple-Choice

1. Choose the most natural sentence using 「よ」 to give new information to your friend: “There is no homework today, you know.”

• A. 今日は宿題がありませんよ。(Kyou wa shukudai ga arimasen yo.)
• B. 今日は宿題がありませんと。(Kyou wa shukudai ga arimasen to.)
• C. 今日は宿題がありませんや。(Kyou wa shukudai ga arimasen ya.)
• D. 今日は宿題がありませんでも。(Kyou wa shukudai ga arimasen demo.)

2. Choose the correct casual sentence with 「よ」: “My cat is a ninja, you know.”

• A. 私の猫はニンジャだよ。(Watashi no neko wa ninja da yo.)
• B. 私の猫はニンジャよです。(Watashi no neko wa ninja yo desu.)
• C. 私の猫はニンジャよだ。(Watashi no neko wa ninja yo da.)
• D. 私の猫はニンジャだね。(Watashi no neko wa ninja da ne.)

3. Choose the correct polite sentence with 「よ」 at the end: “This cake is very sweet, you know.”

• A. このケーキはとても甘いですよ。(Kono kēki wa totemo amai desu yo.)
• B. このケーキはとても甘いよです。(Kono kēki wa totemo amai yo desu.)
• C. このケーキはとても甘いとよ。(Kono kēki wa totemo amai to yo.)
• D. このケーキはとても甘いでも。(Kono kēki wa totemo amai demo.)

4. Choose the best sentence using 「よ」 to correct someone: Your friend thinks the robot is a teacher, but it is actually a student.

• A. あのロボットは先生ですよ。(Ano robotto wa sensei desu yo.)
• B. あのロボットは学生ですよ。(Ano robotto wa gakusei desu yo.)
• C. あのロボットは学生ですと。(Ano robotto wa gakusei desu to.)
• D. あのロボットは学生ですや。(Ano robotto wa gakusei desu ya.)

5. Choose the most natural casual sentence with 「よ」: “I’m really going to Mars tomorrow, you know.”

• A. 明日、火星へ行くよ。(Ashita, kasei e iku yo.)
• B. 明日、火星へ行くと。(Ashita, kasei e iku to.)
• C. 明日、火星へ行くでも。(Ashita, kasei e iku demo.)
• D. 明日、火星へ行くなど。(Ashita, kasei e iku nado.)

Spot-the-Error

6. One sentence below has an unnatural or wrong use of 「よ」. Which one is NOT correct?

• A. このパンダは校長先生ですよ。(Kono panda wa kouchou sensei desu yo.)
• B. 今日は雨ですよ。(Kyou wa ame desu yo.)
• C. 私は学生よです。(Watashi wa gakusei yo desu.)

7. One sentence below has a mistake with the position of 「よ」. Which one is NOT correct?

• A. あの雲はドラゴンの形だよ。(Ano kumo wa doragon no katachi da yo.)
• B. おじいさんは毎朝ダンスするよ。(Ojiisan wa mai asa dansu suru yo.)
• C. この本よはおもしろいです。(Kono hon yo wa omoshiroi desu.)

Translation

8. Translate into Japanese using 「よ」 at the end: “That robot is really kind, you know.”

9. Translate into Japanese using polite form and 「よ」: “There is a secret door behind the fridge, you know.”

10. Translate into Japanese using casual form and 「よ」: “I already finished the test, you know.”

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Answers and Explanations

1. 今日は宿題がありませんよ。(Kyou wa shukudai ga arimasen yo.) — 「よ」 is correctly placed at the end of a normal polite sentence to add friendly emphasis.
2. 私の猫はニンジャだよ。(Watashi no neko wa ninja da yo.) — Casual 「だ + よ」 is the natural pattern; the other options misuse 「よ」 or use a different particle.
3. このケーキはとても甘いですよ。(Kono kēki wa totemo amai desu yo.) — In polite speech, 「です」 comes before 「よ」 at the very end of the sentence.
4. あのロボットは学生ですよ。(Ano robotto wa gakusei desu yo.) — 「よ」 adds a correcting or informative tone, telling your friend the robot is actually a student.
5. 明日、火星へ行くよ。(Ashita, kasei e iku yo.) — Plain verb + 「よ」 is the correct casual form; the others use unrelated particles.
6. 私は学生よです。(Watashi wa gakusei yo desu.) — 「よ」 cannot come before 「です」 like this; it must come at the very end (学生ですよ).
7. この本よはおもしろいです。(Kono hon yo wa omoshiroi desu.) — 「よ」 should not appear in the middle; it belongs at the sentence end (この本はおもしろいですよ).
8. あのロボットはとてもやさしいよ。(Ano robotto wa totemo yasashii yo.) — 「i-adjective + よ」 is the correct pattern to show “really kind, you know” in casual speech.
9. 冷蔵庫の後ろに秘密のドアがありますよ。(Reizōko no ushiro ni himitsu no doa ga arimasu yo.) — A normal polite existence sentence with 「よ」 at the end gives new, fun information.
10. もうテストは終わったよ。(Mou tesuto wa owatta yo.) — Plain past verb + 「よ」 is the natural casual way to say you’ve already finished, with light emphasis.