yeoreumeneun gwairi masisseoyo.

Fruits are delicious in summer.

Breakdown of yeoreumeneun gwairi masisseoyo.

• ~이: subject particle
• ~는: topic particle
• 맛있다: delicious
• 과일: fruit

Questions & Answers about yeoreumeneun gwairi masisseoyo.

Why do we use 여름에는 instead of just 여름에?

The particle combination -에는 is 에 + 는.

• 에 marks a point in time (“in summer”).
• 는 adds the topic/contrast nuance (“as for summer”).
  So 여름에는 emphasizes “when it comes to summer…” or contrasts summer with other seasons. If you said 여름에 과일이 맛있어요, it still means “fruits taste good in summer,” but lacks that topical/contrast feel.

What’s the difference between 과일이 and 과일은 here?

Both are possible, but:

• 과일이 (subject marker -이) simply states that fruits are the subject.
• 과일은 (topic marker -은) would emphasize “as for fruits…”
  Using 이 fits the pattern “In summer, fruits (subject) taste good.” If you said 과일은 맛있어요, it feels more like a general statement about fruits, without the seasonal nuance.

Why do we not add a plural marker for 과일? Why isn’t it 과일들?

Korean nouns are neutral regarding number.

• You only use 들 if you need to explicitly highlight plurality for clarity or emphasis.
• In this context, 과일 naturally covers “fruits” in general, so 들 is unnecessary.