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What’s the difference between wa (は) and ga (が)?

I've been trying to wrap my head around the は/が differences, and I'm trying to figure out the differences between the thematic は and the neutral descriptive が.

Take for example.




Can someone tell me the difference between the switching of the particles?

  • 2
    Decent reference: amazon.co.jp/dp/4874240046
    – Dono
    Jan 15 '13 at 3:26
  • 1
    Could you elaborate on what you mean by this "neutral descriptive が"? I would call "が" used in the latter sentence "exhaustive が". I may be wrong, though.
    – Sindry
    Jan 15 '13 at 4:06
  • Possibly of interest: japanese.stackexchange.com/questions/22/… Jan 15 '13 at 12:02
  • Sorry, I didn't mean to ask what ""neutral descriptive が" is, but rather if "が" in "日本語の授業が面白いです。" really is a neutral descriptiveが or not. This is all due to my lack of words. Thank you anyway.
    – Sindry
    Jan 15 '13 at 13:28

The key to understanding は is to understand how a sentence ties back to the discourse. This is where the "topic" comes in. Some linguists will claim that all Japanese sentences have a topic, even if it's implicit and unstated.

If you're asked:

What do you think about your Japanese lessons?

what ties back to the discourse is "日本語の授業", so it will be marked with は:


On the other hand, if somebody says to you:

You're in a good mood today

what ties back to the discourse is not "日本語の授業", rather, it's the cause-and-effect relationship of why you're in a good mood. Using the sentence with は will sound strange, as if you're switching topics. Rather, to explain why you're in a good mood (staying on topic, although the topic is never explicitly stated), you might say:


Note that this (has a reading which) is not an exhaustive-listing が. I disagree with the answers that claim that there's no "neutral description" が for this sentence because 面白い is not state-change.

Just to preempt possible comments, this sentence does sounds slightly uncommon. Usually it is more idiomatic to add a の/ん, which is another way to tie a sentence into a discourse.

Yes, my Japanese classes are fun!

So to your question in the comments about whether this が is exhaustive-listing or neutral-description, my answer is: "It can be both".


The two sentences are both valid sentences, but would be used in entirely different contexts.

In the は example, you are highlighting the topic of your conversation. Suppose you are in the cafeteria with your friend, and you want to say "Japanese class is interesting, isn't it." You would use particle は thus:


You are introducing a new topic of conversation, and so the は particle hilights what it is you are talking about. A literal translation of this is something like "Speaking about Japanese Class, interesting, right?" I find using "Speaking about" as a translation for は helps to remember it.

が is used to highlight the specific subject of a sentence, when you want to clarify what it is you are talking about inside of a specific context. For example, your friend is asking you about the classes you are taking at college:


"Speaking about your college classes, which is interesting?" In this case, replying using the sentence above with は would sound unnatural, like you are changing the subject (which you are because は introduces a new topic!). Instead, you would reply naturally:


This は・が distinction extends to other things, for example the simple "I like" sentence. Say your friends are talking about what fruits they like, and you want to chime in by telling them you like apples:


"Speaking about me, apples are liked." In this case, the topic of conversation is you, and what you like. The specific subject of your sentence is apples - that you like them. You would drop the 私は if someone explicitly asked you which fruit you like - you don't need to change the topic because they are already talking about you.


はis A more of a topic marker while が is not. For instance こんにちは marks the topic of "This day".

  • 3
    Welcome to JLU! Although the question will most likely be closed as a duplicate, your answer is kind of brief. Is は just "more of" a topic marker or just "the" topic marker? Also, the OP does not seem to understand what is mean by "topic" (or "theme"). Maybe an example sentence would help the OP makes more sense of it...
    – Earthliŋ
    Jan 15 '13 at 16:42
  • +1, great answer.
    – oldergod
    Jan 16 '13 at 0:07

As you probably know, は/が distinction can fill entire grammar dictionaries; I know, I have one. So there are many facets to have they differ. But one way I try to remember is that is the topic marker and is more of a specific indicator. So with your examples it would be like

  • 日本語の授業は面白いです。 → "Speaking of"/"As for" (my) Japanese class, it is interesting. This is looking only at the frame of reference of the class (the class is the topic). Nothing else is considered.
  • 日本語の授業が面白いです。 → "The Japanese class is what is interesting."/Japanese is the specific class (or thing) (out of possibly others) that is interesting." Note that in this kind of sentence, the topic being discussed (whether literally or implied) is probably different. The discussion might have been about different classes, and you single out one as interesting. Or it might have been about things you find interesting, and you pinpoint the Japanese class.

So I try to remember that one of 's major functions it to point to one specific example that the description applies to.


The difficulty with your example is partly that this が is not neutral description. As Sindry commented, this one is "exclusive listing". From Kuno's book (and quoted here):

"Sentences of neutral description present an objectively observable action, existence, or temporary state as a new event."

Somewhat more particularly:

neutral description only works with action verbs, existential verbs, and adjectives/nominal adjectives that represent state change

面白い does not represent state change, it's quite clearly referring to a state. As a general rule, 形容詞 can only be neutral description in the sentence-final ending in cases where something changes in front of your eyes (color change, for example).

As mentioned above, neutral description-が is used for describing something that is actively happening. This limits the usage basically to situations where you watch something happen, and comment on it, or situations that could be extrapolated from that theme. There is also the slightly odd exception of the existential verbs: aru and iru, which can also work with a 'neutral descriptive'-が.

Thematic-は, on the other hand, is used to bring things up again in the conversation. If we talked for awhile about A, then shifted to talking about B (or if A was a minor point in talking about B), one of us could shift the topic of conversation by starting out with "Aは。。。".

  • I have a MUCH harder time distinguishing thematic and contrastive-は, and some linguists argue that the distinction doesn't actually exist. (I think the argument is that there is no such thing as a thematic-は without a contrastive element)
    – jkerian
    Jan 15 '13 at 15:39
  • "neutral description only works with action verbs, existential verbs, and adjectives/nominal adjectives that represent state change". Are you sure this is from Kuno's "The Structure of the Japanese Language"? I've seen lots of grammatical examples in the book which don't follow this, like "空が青い" or something to that extent. I don't have the book with me right now, but I can give specific page numbers later.
    – dainichi
    Jan 16 '13 at 1:23
  • @dainichi: It's in there, I think. (might have been a paraphrase) "represent state change" refers to the context, though... not the specific verb. I was trying to get at that in the next sentence or two... you expanded somewhat more on it.
    – jkerian
    Jan 16 '13 at 3:50

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