Lesson 04: Whose is this?

You can already use これ (KORE) to refer to an object on its own. But in ‘this book’, you name the object immediately too. Use この (KONO) directly before ほん (HON) for that. Together, このほん (KONO HON) forms one noun phrase. A noun is a word such as book, bag or person; the phrase identifies exactly which thing you mean.

The distances stay the same as in lesson 03. この is near you, その (SONO) near the other person and あの (ANO) away from both. The difference is what must follow: these three forms need a noun here. Do not say このです to mean ‘it is this’. Compare the three blocks below, then replace ほん with かばん (KABAN).

You know わたし (WATASHI) and せんせい (SENSEI) from lesson 02. ともだち (TOMODACHI) adds ‘friend’. These words can identify the owner of an object. だれ (DARE) asks who that person is. You do not need to memorise separate forms for my, your or his to start using these examples.

にほんご (NIHONGO) is the Japanese language and えいご (EIGO) the English language. They do not name an owner but will help describe a type of book. Read the meaning first and then listen to each word. With かばん (KABAN), which you already know, keep the short form: an extra N creates a different word. Review the cards if the words are not yet easy to recall when building a sentence.

The small word の (NO) connects two nouns. For possession, the owner comes first and the owned object last. わたしのほん (WATASHI NO HON) therefore means ‘my book’. The head noun is ほん: the whole phrase names a book, not a person. Reversing the two sides changes the meaning; their order is not interchangeable.

You can put this phrase in the information position before です. これはせんせいのかばんです (KORE WA SENSEI NO KABAN DESU) first identifies ‘this’, then says ‘the teacher's bag’. の does not itself mean ‘is’. Notice that the sentence still has です as its ending. Explore the grammar on の if you are still mixing up owner and object.

これはせんせいのかばんです。

If the owner is unknown, put だれ (DARE) in the owner's position. だれのかばん (DARE NO KABAN) means ‘whose bag’. In the question below, the bag has already been named with このかばん (KONO KABAN). It need not be repeated: だれのですか (DARE NO DESU KA) asks whose it is. The context makes the object clear.

You can answer わたしのです (WATASHI NO DESU), ‘it is mine’. The omitted word here is ‘bag’. This short answer is not a new verb rule. To name the object, say わたしのかばんです (WATASHI NO KABAN DESU), without another の after かばん. Try the short response first, then expand it.

このかばんはだれのですか。

わたしのです。

The link の can also describe a category or content. にほんごのじしょ (NIHONGO NO JISHO) is a Japanese-language dictionary. ‘Japanese’ does not own the dictionary. You still read from the description on the left to the head noun on the right. The same construction can express different relationships.

Now compare two questions. だれのほん (DARE NO HON) asks for a book's owner. なんのほん (NAN NO HON) asks here what kind of book it is. In this lesson, the answer えいごのほん (EIGO NO HON) can identify an English-language book. Do not automatically choose だれ whenever you see の; identify the missing information.

これはなんのほんですか。

えいごのほんです。

Put down a book and imagine an owner and a subject for it. First identify it with このほん (KONO HON). Then say who owns it and what kind of book it is. Ask the matching question for each answer. This gives の two clear functions without treating them as unrelated rules.

The model for your own application stays hidden until you open it. Check the order especially: description before の, head noun after it. A short possessive answer may omit that head noun. The final check does not require new negative forms or unfamiliar verbs. Those come in later lessons; focus now on identifying things precisely.