そんな picks up the kind the listener just introduced

そんな means “that kind of,” “like that,” or “such.” Its most useful everyday pattern is そんな + noun: そんな店(みせ) is “that kind of shop,” そんな話(はなし) is “a story like that,” and そんな方法(ほうほう) is “that kind of method.” The kind or situation usually belongs to the listener’s side of the moment. The listener may have just described it, may be holding it, or may be dealing with it.

That listener connection is why そんな is so common in replies. If a friend says that a shop sells a narrow rolling cart, そんなワゴンを探(さが)していた means “I was looking for that kind of cart.” You are not selecting a cart that both people have already identified. You are picking up the type your friend just introduced.

Choose a kind with そんな, not a particular item

Compare その箱(ばこ) and そんな箱(ばこ). その箱(ばこ) selects a particular box: “that box.” そんな箱(ばこ) describes a kind of box: “a box like that.” The Japan Foundation’s teaching chart makes the same structural distinction: the この・その・あの series limits which noun you mean, while the こんな・そんな・あんな series describes the noun’s kind, character, or state.

This difference matters in ordinary requests. If a clerk is already holding one exact storage box, その箱(ばこ)を見(み)せてください asks to see that box. If a friend describes a transparent box with a lid, そんな箱(ばこ)を探(さが)しています says you are looking for that kind of box. English “that” can cover both, so decide whether you mean one identified object or a type.

Hear where the description comes from

The こ・そ・あ choice is not only about physical distance. In conversation, it also tracks who brought the topic into the shared space.

こんな often presents a kind from the speaker’s side. You may be holding an object, demonstrating an idea, or introducing your own example: こんな箱(ばこ)なら使(つか)いやすい means “A box like this would be easy to use.”

そんな often picks up what the listener said, did, has, or is facing: そんな仕事(しごと)があるんですか means “Is there that kind of job?” after the listener describes it.

あんな can point to something away from both people or something both already know from a shared scene or memory: あんな大(おお)きなソファはもう買(か)わない means “I will not buy another huge sofa like that,” when both people know the sofa being recalled.

These are practical viewpoints, not a rule that every conversation has only one possible answer. Real speakers can shift viewpoint when they present an idea as newly vivid, align with the listener, or recall a shared event. Start with the plain question: whose example is active right now?

Keep そんな and そんなに in different jobs

Before a noun, use そんな + noun for a kind: そんな店(みせ), そんな話(はなし), そんな道具(どうぐ). With に, そんなに usually modifies the degree of an adjective, verb, or state: そんなに高(たか)いんですか is “Is it that expensive?” and そんなに急(いそ)がなくていい is “You do not need to hurry that much.”

Do not memorize そんなに as automatically negative. A dictionary example such as そんなに高(たか)い時計(とけい) points to a high degree without a negative ending. Negative sentences are common because speakers often reassure, question, or push back on a degree, but the predicate determines whether the whole sentence is affirmative or negative.

Let short reactions stay short

In colloquial speech, そんな！ can stand alone as “No way!” or “It cannot be!” It reacts emotionally to something the listener has just said. Use it when the surprise, disbelief, or disappointment is genuinely strong. A calm request for more information usually needs a full sentence instead.

A different everyday expression is そんなことない or polite そんなことないです. It denies the idea just expressed: “That is not true,” “Not really,” or “It is not like that.” It can answer criticism, correct an assumption, or gently push back on praise. The Japan Foundation teaches it as a complete conversational response. It is not the same as a shocked そんな！, even though both respond to the listener’s words.

Finding storage for a smaller apartment

Aoi is moving into a smaller apartment, and Ren is helping her choose storage that will work in daily life. Ren starts by describing something he saw at a reuse shop.

そんなワゴン picks up the type Ren introduced: narrow and practical for a small room. No exact cart has been selected yet.

At the shop, Aoi lifts a clear storage box and presents it as her own example.

こんな fits because Aoi is holding up the example and bringing it into the conversation from her side.

They also ask about a shelf. The clerk gives them an unexpectedly long delivery time.

Here そんなに measures the degree of time. It does not describe a kind of delivery.

Then the cart Ren mentioned seems to be gone.

The standalone そんな carries real disappointment. The following sentence explains what expectation was broken.

The clerk finds a similar cart in the storeroom, and the two friends finish organizing the room that evening. Ren compliments Aoi.

そんなことない gently rejects the praise as stated. It is a full response, not the shocked interjection from the shop.

Finally, they remember the oversized sofa from Aoi’s previous apartment.

あんな works because the sofa belongs to a shared memory that both friends can identify.

When choosing, ask three questions. Are you selecting one exact object? Use その + noun. Are you responding to a kind or situation introduced from the listener’s side? Use そんな + noun. Are you reacting to how high, long, fast, or intense something is? Use そんなに with the adjective, verb, or state. Then choose こんな or あんな only if the viewpoint has shifted to the speaker’s current example or to something shared and removed from the present exchange.