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Subject Particles - 는 / 은 and 가 / 이

는/은 and 가/이 both are used for the subject of a sentence but 는/은 introduces a topic or a subject whereas 가/이 identifies a subject.

In addition to their differences already explored above, here is another big difference between the two particles.

The topic particle, 는/은, is used in cases when we make a general or factual statement whereas 가/이 is not.

For example,

• 치타는 빠르다 = Cheetah is fast
• 치타는 느리다 = Cheetah is slow (This would be a wrong statement)

However, if you visited a zoo and saw a cheetah who seems to move very slowly, you might say,
• 치타가 느리다 = (That) cheetah is slow

So the identifier particle, 가/이, indicates a certain person or thing that the speaker and listener know or are aware of. In this case, it would be that cheetah in the zoo.

Here is another example,
• 바다는 푸르다 = The sea is blue
• 바다는 까맣다 = The sea is black (In general, this is a wrong statement.)

But say, you saw the sea at night and you may exclaim,
• 바다가 까맣다! = The sea is black!

The sea in this sentence is identified as a particular sea at night, and both the speaker and listener know which sea is being talked about. This is not a general statement. Therefore the identifier particle, 가/이, is used in this case.

Of course, 바다가 푸르다 is also perfectly acceptable. However, the difference is that the sea in this sentence is also a particular sea that is known by both the speaker and the listener.
• 바다는 푸르다 = The sea is blue (A general statement)
• 바다가 푸르다 = The sea is blue (The sea is identified and known by the speaker and listener)

It's similar to the way articles are used in English.

For example,
• An apple is red = 사과는 빨갛다  (A general or factual statement about an apple)
• The apple is red = 사과가 빨갛다 (A particular apple that the speaker identifies and indicates to the listener)

Continue to the next section:

1. I'm still having difficulty determining when to use 가/이 또는 은/는 . . .

1. hi 이자민,

here's the simple way of thinking 가/이 and 은/는.

simply put,

이/가 is used for a specific statement,

은/는 is used for a general statement.

for example,
a building = 빌딩은, the building = 빌딩이

2. I still don't fully understand the difference between 이/가 and 은/는, or when to use 이/가.

1. simply put,

이/가 is used for a specific statement,

은/는 is used for a general statement.

for example,
a building = 빌딩은, the building = 빌딩이

2. 이 after consonants
가 after vowels.

3. The examples you give for general statements would be more correct in the plural form.

"Cheetahs are fast.", instead of "A cheetah is fast."

Your website is really useful, by the way. Thank you for taking the time to make it!

1. thanks, noted!

though I can't use the plural form in Korean cos that'd be different in meaning.

So I guess, go with a grammatical error.

4. thank you, you helped a lot! very clear explanation :)

5. This explanation is perfect. Very helpful indeed. Thanks a lot for your hard work.

6. Hi,

you mean we use 가/이 when we talk about something we know about it or something we see it in the seam time

is tat all right

1. 가/이 is used when we both know what specifically we're talking about.

For example, a building = 빌딩은, the building = 빌딩이

hope this helps.

7. I understand! Thank you soo much!!!!

8. thank you so much !

9. OMO, thankss <333333

10. OMO, Thxxxxxx