What to study for radicals, compound words, and reading choice
N4 learners meet enough characters to need a system. This guide shows how to break compounds into useful parts, choose the reading from context, and build a memory hook that works in English, Vietnamese, Spanish, or your own study language.
The useful unit is not a character or sound by itself. It is a Japanese word inside a situation. Read the examples aloud, notice the repeated patterns, and connect each new item to a task you would ask an AI Japanese teacher to practise with you.
Work in small, repeatable sets. Five focused items are enough for one session if you can retrieve them without looking, recognise them in a new sentence, and explain the difference between a correct answer and a tempting wrong one. That kind of practice is especially valuable for JLPT preparation because the test changes the surrounding vocabulary while keeping the underlying skill constant.
Memory tricks and core examples
Treat a compound as a two-panel comic. 旅 is a person carrying a flag on a journey; 行 is a crossroads, so 旅行 becomes a person moving through a crossroads. For 便利, imagine a person 亻 using a sharp tool to make life convenient.
| 日本人 | 羅馬字 | 意義 |
|---|---|---|
| 旅行 | りょこう / ryokō | travel |
| 料理 | りょうり / ryōri | cooking; cuisine |
| 経験 | けいけん / keiken | experience |
| 必要 | ひつよう / hitsuyō | necessary |
| 便利 | べんり / benri | convenient |
Read the word, not only the character
| Study move | Why it helps | AI Sensei prompt |
|---|---|---|
| See the shape | Creates a visual anchor | Give me a five-second image clue |
| Read the word | Selects the correct reading | Quiz me in a sentence |
| Contrast a pair | Prevents look-alike errors | Test two similar compounds |
| Use it personally | Builds retrieval | Ask me a real-life question |
How to make the trick stick
- Review the character in three different words, not three copies of one word.
- Say the reading before looking at the answer.
- Keep a contrast pair beside every character you often confuse.
- Write a one-line memory story in the language you think in most naturally.
- Return to the word after one day, three days, and one week.
A review plan for this JLPT level
Use a three-stage Kanji review. On day one, learn the shape, reading, and one concrete word. On day three, retrieve the word from its meaning and write a second compound. At the end of the week, read a short passage and mark every target character you can recognise in context. For the higher levels, add a paraphrase because advanced kanji often have several close English translations.
Keep a mistake log with three columns: what I expected, what the Japanese actually did, and what clue I missed. This turns an incorrect answer into a future prediction. It also gives your AI Sensei useful material for personalised drills instead of sending you back to a generic exercise.
The next JLPT level
N3 compounds such as 経済, 環境, and 説明 reuse the same strategy but demand more abstract meanings. A strong N4 habit of recording word families will make N3 reading speed noticeably better.
Use this article as a level checkpoint, not a finish line. When the core items feel automatic, raise the challenge one step: longer compounds for Kanji, or less transcript support and longer turns for Listening. Unihongo's AI Sensei can keep the practice at the edge of your level and turn mistakes into the next personalised exercise.