## What is the difference between 〜となる and 〜になる?

51

37

Is it a nuance difference? Is it formality?

EDIT

For example:

I just made that example up, but for some reason, my gut tells me it's the first one, even though I don't see anything grammatically wrong with the second, either. Is it formality level only?

Could you give an example phrase? – wallyqs – 2011-05-31T23:43:07.870

@wallyqs - hai douzo – makdad – 2011-06-01T00:32:49.073

@Andry: I voted to reject the edit you suggested to add furigana. Please see this post on meta about adding furigana to other user’s posts. The consensus is that we should not add furigana just because it is generally useful to some learners.

– Tsuyoshi Ito – 2012-11-08T22:57:13.940

1Actually, in your example situation, ～となる indicates a decision or a "rule" of sorts. "(It's our rule that) we only accept cash for the payment of the bill. Please understand." – istrasci – 2011-06-01T01:52:56.313

In my previous comment, the first link should have been this one.

– Tsuyoshi Ito – 2012-12-06T13:19:15.457

@istrasci - oooh, really? Do you have a reference on that? (I believe you, I just want to read up!) – makdad – 2011-06-01T02:42:12.107

Probably, but it's not in my grammar book where I was thinking it was. I'll keep looking. Actually, in this usage (as a "rule"), I think it's more common to see it as ～となっています. – istrasci – 2011-06-01T02:48:37.073

9

Pretty finely nuanced, I'd say. と is a quotative particle, but is also used to described the manner in which something is done, often figurative. ～となる can be used to mean "become like a ~" while ～になる is literally "become a ~".

right. Is と always quotatative though? What about とする？ – makdad – 2011-05-31T23:50:15.580

@makdad- that's used for assumption. Say in a math text book when a problem is being set up or when you are role playing. Kind of similar to "let x be the complex conjugate of...", "let's say that..." or "assume...". – Nate Glenn – 2011-05-31T23:52:36.107

1right, but there's also shiyou-to-suru. I don't think "to" is always quotative, right? Is the to-naru case one of its non-quotative usages? – makdad – 2011-06-01T00:33:09.853

2@makdad right, not always quotative. There's also "and". – Nate Glenn – 2011-06-01T01:07:12.097

1@makdad So the answer I gave above was the one given to me by a native Japanese teacher. I found another one in a grammar book. となるcan mean the same as になる but is more formal. For example, 吉田さんが初代の委員長となった。 – Nate Glenn – 2011-06-01T08:25:08.690

54

I've asked this very question in the past and my research led me to the following definition which (surprisingly) differs from every other answer here so far:

～となる expresses a discrete change, while ～になる can express either a discrete or a continuous change.

You can feasibly use ～になる for everything, since it covers all cases, but in cases where you want to use the most suitable grammatical phrasing (such as in formal situations), you often see this distinction made.

Examples:

その島は去年、無人島となった。 (～となる because the change from "inhabited" to "uninhabited" is discrete and happens the instant the last person leaves.)

デビューした後、彼はだんだん人気者になっていった。 (～になる because popularity changes continuously in unmeasurable steps.)

スカイツリーは現在、日本一高い建造物となっている。 (～となる because the title of "tallest building in Japan" applies to exactly one building, and a building cannot gradually become the tallest. It either is or it isn't.)

Your example in the question illustrates a discrete change in state (or more precisely, a discrete difference between 現金 and all other forms of payment), so both ～となる and ～になる are acceptable. However, since ～となる is "built" for such situations as these, it sounds more "proper" to use ～となる.

I suspect this rule also applies to the ～とする and ～にする forms, but I would have to do more research to confirm this.

@DerekSchaab I know this is an OLD thread but do you still hold this opinion? I recently had a disagreement about the difference between ～と決める vs ～に決める because the other person was claiming that it is analogous to ～となる vs　～になる which I believe is incorrect. It might be interesting to apply your theory to that construction too. – kandyman – 2018-12-13T10:54:51.983

@Harkcome: I voted to reject your suggested edit. 日本一 is a valid word, whereas 日本一番 is not.

– Tsuyoshi Ito – 2013-01-01T16:06:27.103

+1 The clearest. But just one thing: 人気になる is ungrammatical. It has to be 人気者になる. – None – 2011-07-19T04:54:39.560

Is it true that になる can be used for everything? For example, I learned 「X こととなると」 as a set phrase which means roughly "When it comes to X", used to explain an exception to the rule. Like "When it comes math, I just can't do it (but I'm good at everything else!)" – Zach – 2011-07-19T17:18:55.637

@Zach: I can't think of any ～となる situations that can't be handled with ～になる, so yes. 「Xこと なると」 is perfectly fine: こんなことになるとは思わなかった。 ("I never thought it would come to this."); 自分自身のことになると人は盲目になる。 ("When it comes to their own selves, people are blind."). – Derek Schaab – 2011-07-19T17:37:32.423

Well what about this: 走ることになると優しく疲れるようになる。 It seems to have a different meaning, or at least a different nuance, when using に than with と. With に, it sounds to me like "Whenever I start running, I get tired easily." Whereas with と, it sounds more like running is an exception to the rule, and many other types of activities don't make me tired. Am I wrong here? (It's certainly possible) – Zach – 2011-07-19T19:19:04.633

@Zach: I don't detect the same nuance you do here. From the standpoint of which is more common, you will find that ～になる is more common than ～となる, simply because it covers more cases. (～となる also sounds more "formal" to some speakers.) The phrase "走ることになると" is about five times more common than the phrase "走ることとなると" on Google (take with the usual dose of salt). (But the second half of your example sentence is unnatural. A better way to say that would be すぐ疲れてしまう or 疲れやすい. 優しく means "kindly" and 易しく (same reading) means "without difficulty", neither of which is what you mean here.) – Derek Schaab – 2011-07-19T20:01:27.170

7

From what I have learned and observed, ～となる implies a "suppose if" conditional, something similar to "suppose if it is the case that [X] would become [Y] then" where as ～になる simply means "[X] becomes [Y]".

「請求書のお支払いは現金のみとなりますので、ご了承くださいませ。」 would mean something like "Suppose if you need to pay your purchase by cash, we hope to get your understanding.". This implies that there are times that the shop does allow you to pay using other means than cash.

「請求書のお支払いは現金のみになりますので、ご了承くださいませ。」 lacks the "suppose if" connotation so it simply means "As a matter of fact, you need to pay your purchase by cash, so we hope to get your understanding.".

Great answer! I was having difficulty in trying to explain this one. When I could only say that the first one somehow gives you a degree of freedom, while in the second case, there's nothing you can do because of circumstances that's been predetermined, you managed to put it in comprehensible words! – syockit – 2011-06-02T00:38:41.053

5

～となる　is also limited to nouns, I believe. The way I've heard it most often used is when the thing it becomes kind of fulfills some purpose. Kind of hard to explain. Here's my best example:

• 私は先生になります　→　I will become a teacher.
• 寄付となる金を貯金します　→　I deposit all money that will be (used for) donated.

Don't know if that helps at all.

But isn't ～になる also limited to nouns? – kandyman – 2018-12-13T10:50:18.293

2

I've heard that ~となります is popular to use because "it sounds formal", but actually its usage is incorrect, since です should be used instead. I'd guess that the same thing happens with になります、which would be just another form of saying です incorrectly (in this context).

Formalish way : 請求書のお支払いは現金のみとなりますので、ご了承くださいませ。

Correct way : 請求書のお支払いは現金のみですので、ご了承くださいませ。

Don't really know someone who is able to answer this question...

1@TsuyoshiIto My personal feeling is that となります is "less wrong" than になります. While になります is obvious ファミコン語 (language used by employees at family restaurants and convenience stores), となります seems to be used broadly in more legit sources, often to imply a rule or an obligation, like in the example or e.g. 降車時のお支払いとなります (Please pay when you get off). I'm curious if this usage was taken into general use before になります, and that is why it "feels more legit". – dainichi – 2012-01-24T08:37:44.270

@dainichi: Thanks for the comment. I agree that …となります is sometimes used as a euphemism for a command or a request as in your example, but I think that …になります is also used in the same way. In addition, I am not sure if …と/になります which means a request is less wrong than …と/になります which is used in place of a copula (as in the original question). In all cases, …となる is considered either more formal or more polite than …になる, but this does not immediately imply that using と makes it less wrong. – Tsuyoshi Ito – 2012-01-24T14:37:30.170

@TsuyoshiIto Well, right and wrong are subjective feelings. I just think there might be quite a few people who feel comfortable about one, but not the other. While looking for examples on Google, I found this: http://okwave.jp/qa/q6489884.html. The poster is complaining about ファミコン語(albeit not になります), but using slightly dubious expressions like シチュエーション的 and となります himself/herself.

– dainichi – 2012-01-24T15:00:31.257

@dainichi: Haha, nice find. I understand that you are talking about how people feel about the usages, not the absolute correctness (even if there is such a thing). You may be right about the number of people feeling comfortable about one and not about the other, but I do not know. I guess that a vast majority of people do not mind either of them, and that knowing the statistics about the rest is difficult. – Tsuyoshi Ito – 2012-01-24T15:47:11.680

@TsuyoshiIto In the perfectly valid expressions 聖なる, 単なる, のみならず etc. there seems to be no change at all. So I am just saying that using なる as a copula is not a new thing at all. I realize that these usages are different from OP's examples, but just to add some color... – dainichi – 2012-01-26T00:59:24.447

@dainichi: They are auxiliary verb なり, not verb なる. – Tsuyoshi Ito – 2012-01-26T02:21:45.700

@TsuyoshiIto, Aha, thanks for pointing that out. I'm not very strong in classical Japanese. Are you saying that both verbs have 連体形 なる, but the auxiliary verb has 終止形 なり, whereas the non-auxiliary なる has 終止形 なる, even classically? If this is the case, you've completely convinced me, although I'm still surprised that they do not share etymology. – dainichi – 2012-01-26T03:25:47.547

1@dainichi: Yes, in classical Japanese, they have the same 連体形 and different 終止形 as you said. I do not know if they share etymology or not, but I doubt that. Auxiliary verb なり arose from にあり (particle に + verb あり), whereas 終止形 of non-auxiliary verb なる was always なる and never なり if I am not mistaken. – Tsuyoshi Ito – 2012-01-26T12:54:28.807

@TsuyoshiIto That makes total sense, you've convinced me. Thank you very much for taking the time to explain. – dainichi – 2012-01-26T12:58:06.433

2It is true that some people (including me :)) consider this usage of となります/になります to be incorrect, unless it means a change (of the allowed payment methods in this case). Some of them even say that they are annoyed by this usage. On the other hand, this usage is quite common nowadays, and its meaning is understood, so it seems to be a moot point discussing whether it is “correct” or not. All I can say is that I would avoid (or at least try to avoid) this usage and that I would not recommend this usage to others, but this is just a personal preference. – Tsuyoshi Ito – 2011-06-07T22:45:37.230

No offence intended to wallyqs, but why is this answer being voted up? It is hearsay ("I've heard.."), speculation ("I'd guess..."), and ends with an admission that he doesn't actually know the answer. Apologies to wallyqs, but for those reasons I have voted this down. – kandyman – 2018-01-29T19:02:28.720

-1

According to "A Dictionary of Intermediate Japanese", there are only 2 differences between になる and となる.

(1) となる is more formal and only used in written Japanese.

(2) となる cannot be used with な-adjectives.

となる cannot be used with な-adjectives -- 「きれいなる」「元気なる」とかはダメだなってわかるんですけど、「明らかなる」「必要なります」「重要なる」とかって結構聞きますよね・・実は誤用で、本来は「明らかなる」「必要なります」「重要なる」って言わないといけないとかですかね・・どうなんでしょうね・・ – Chocolate – 2017-11-08T04:19:36.967

@Chocolate yes, according to that dictionary at least, the correct usage is 「明らかになる」,「必要になります」, and「重要‌​になる」. It might be a case where the 'rule' is so subtle that even native speakers aren't aware of it. – kandyman – 2017-11-08T10:44:19.083

となる can be used in spoken language as well and there are several differences in nuance between the two. – a20 – 2018-01-29T11:31:51.743

2@bjorn What are the differences and what is your source? – kandyman – 2018-01-29T18:58:44.310