jega johahaneun pyohyeoneun “gamsahapnida”yeyo.

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Breakdown of jega johahaneun pyohyeoneun “gamsahapnida”yeyo.

• 이다: to be
• ~가: subject particle
• ~은: topic particle

Questions & Answers about jega johahaneun pyohyeoneun “gamsahapnida”yeyo.

Why is 제가 used instead of 저는 at the beginning?

In the phrase 제가 좋아하는 표현, 제가 uses the subject marker -가, which is required inside a relative (noun-modifying) clause. Here you’re literally saying “the expression that I like.” If you tried 저는 좋아하는 표현, you’d be marking “I” as the topic of the main clause, which doesn’t work when you want to directly modify 표현.

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What does 좋아하는 표현 mean, and why is 좋아하는 placed before 표현?

Korean uses verb stems in an attributive form to modify nouns.

• 좋아하다 = “to like”
• 좋아하는 = “that (someone) likes” (attributive form)
  So 좋아하는 표현 literally means “the expression (표현) that (I) like.” Placing 좋아하는 before 표현 turns the verb into an adjective for that noun.

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Why is 표현 followed by the topic marker -은 (as in 표현은)? Could you use -이/-가 instead?

-은 marks 표현 as the topic of the main clause: “As for the expression I like…”
If you used 표현이, you’d be marking it as the subject, which doesn’t flow naturally into -예요 here. The topic marker lets you introduce 표현 and then comment on it (“it is ‘감사합니다’”).

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Why does the sentence end with 예요 rather than the more formal 입니다?