I have two questions that I think are quite related regarding the interpretation of comparatives.

1. Is it necessary to include a より or a 方 expression to convey a comparative?

Suppose you are having a conversation about how the book you just read was too long. You are then asked what you want to do later. You respond:


I want to buy a shorter book than the one I read yesterday.
(Please bear in mind that I constructed the Japanese sentence above, so it could be wrong in any number of ways. I'd appreciate a correction if required.)

My question is, if you responded with simply:


would it be interpreted as implying "shorter" (where "shorter" is drawing a comparison to the book previously mentioned in context), or "short" (where "short" is not explicitly compared to anything), or perhaps it is unclear?

Furthermore, is there an alternate way to express the comparison without explicitly stating 「昨日読んだ本」?

2. Do なる expressions imply comparison or must it be explicitly stated?

I'd like to compare the following English sentences:

  1. The road became wide.

  2. The road became wider.

Sentence 1 states that something changed and now the road is wide (as opposed to narrow). Sentence 2 states that something changed and now the road is wider than it used to be. It does not actually state that the road is wide.

As far as I know, both of these sentences would be translated to:


Is my translation correct for both cases and if so, how could it be altered to differentiate between the two English meanings?

  • Perhaps you can use words like もっと、さらに、より広く if you want stress the fact that it became -even- wider. (was wide now even wider)
    – Leo
    Mar 1, 2017 at 9:38

2 Answers 2


"Is it necessary to include a より or a 方{ほう} expression to convey a comparative?"

In many cases, yes, but certainly not in all cases.

The key factor here is whether or not the comparison is made against a concrete example as the standard. That is to say, one needs to consider whether the comparison is absolute or relative. In other words, is it objective or subjective?


In this sentence, the comparison being made is basically objective. Why so? Because the speaker knows exactly how long the book he read yesterday was. Today, he wants to buy a shorter one.

(For those wondering, the use of 「が」 there is completely natural.)

「短い本が買いたい。」 ("I want to buy a short book.")

This sentence, when uttered all by itself, can only mean "I want to buy a short book." It does not mean "I want to buy a shorter book."

There is, however, an easy way to express "a shorter book" without comparing it to another actually existing book. In other words, the book only needs to be "kind of short" by the speaker's own standards. That phrase would be:

「短の本が買いたい。」 ("I want to buy a shorter book.")

How short is 短め, only the speaker knows because that is a subjective judgement. Important thing is that the sentence makes perfect sense to the speaker while it might sound ambiguous to some others.

"Do なる expressions imply comparison or must it be explicitly stated?"

Great question. They do generally imply comparison. Otherwise, what is the use of our magic verb 「なる」, which is used to express "change of state"? You cannot talk about "change" without making some kind of comparison, can you?


undoubtedly means "The road became wider (than it was at an unmentioned time)." You simply cannot say that sentence if the road width has not changed. Using 「なる」 means there has been a change.

You could say:


to state the standard of comparison by adding "than before", but the point of the matter is that "than before" is already implied in the sentence without 「以前より」.


About question 1: Yes, より is necessary to compare with other things. 短い本が買いたい means "I want to buy a short book" and it doesn't compare with other books. And 短い本 is unnatural. 薄い本 would be natural as the meaning.

About questions 2: 道が広くなった means "The road is wider than it used to be", we can't know that the road is actually wide or not by only this sentence. If you want to say the road isn't actually wide, you should add the sentence "実際は広くない" or you can say "前よりは広くなった". 道が前よりは広くなった can imply "The road only became wider than it used to be." and the road isn't necessary to be actually wide.

  • この本はどうですか?いや、短い本を買いたいです。I think in this example the person doesn't use より but still implies that they want a shorter book (comparatively) by asserting that they don't consider the specified book to be "short".
    – Leo
    Mar 1, 2017 at 9:34
  • It may imply so but we usually say いや、もっと薄い本を買いたいです or いや、それより薄い本を買いたいです. Mar 1, 2017 at 9:47
  • I agree with you that using もっと・より sounds much better but the question was is it -necessary-? Is it 100% -necessary- or can the meaning be implied?
    – Leo
    Mar 1, 2017 at 9:56
  • I think It depend on the situation. 薄い本を買いたい itself doesn't have a comparison with others. However この本はどうですか? is said in your example, so 薄い本を買いたい can imply a comparison but adding もっと・より would be natural. Mar 1, 2017 at 10:09
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    @G-Cam I think we usually use the words 厚い, 薄い for books. I feel 短い本 and 長い本 are unnatural. However if you say 短い本, I can understand you say it as the meaning of 薄い本. Mar 4, 2017 at 3:10

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