geunyeoneun tomato juseureul du keobina masyeossne. manhi deowossna bwa.

-는 is the topic marker. It sets up 그녀 as the topic of the sentence: as for her...

So 그녀는 토마토 주스를 두 컵이나 마셨네 feels like:

• As for her, she drank as many as two cups of tomato juice.

It does not just mark the subject mechanically; it also gives a slight sense of contrast or topic framing, depending on context.

Not usually. In natural Korean, pronouns like 그녀 are used much less often than English pronouns such as she.

Very often, Korean would simply omit it if the person is already clear from context:

• 토마토 주스를 두 컵이나 마셨네.

That said, 그녀는 can still appear in textbook-style sentences, translations, writing, or when the speaker wants to make the subject explicit.

주스를 is 주스 + 를, the object marker.

It marks tomato juice as the thing being drunk.

• 토마토 주스 = tomato juice
• 토마토 주스를 = tomato juice + object marker

Because 주스 ends in a vowel sound, it takes -를 rather than -을.

Korean uses a special shortened form of some native Korean numbers before counters.

Here, the counter is 컵.

• 둘 = two
• before a counter, it becomes 두
• so: 두 컵 = two cups

Similar examples:

• 하나 → 한 명
• 둘 → 두 개
• 셋 → 세 명
• 넷 → 네 개

So 두 컵 is the correct form before the counter.

Here, -이나 adds emphasis. It means something like:

• as many as
• no less than
• a whole

So 두 컵이나 마셨네 is not just she drank two cups, but more like:

• She drank as many as two cups.
• Wow, she drank two whole cups.

It shows the speaker thinks that amount is somewhat surprising, impressive, or more than expected.

Usually it adds some kind of emphasis, and often that includes surprise, but the exact feeling depends on context.

For example, it can suggest:

• the amount is more than expected
• the amount feels a lot
• the speaker is impressed
• the speaker is slightly surprised

So in this sentence, it helps set up the next thought: if she drank that much tomato juice, maybe it was very hot.

The ending -네 expresses the speaker’s realization, observation, or mild surprise.

So 마셨네 sounds like:

• Oh, she drank two cups.
• Looks like she drank two cups.
• Wow, she drank two cups.

Compared with other endings:

• 마셨어 = plain statement
• 마셨다 = neutral narrative/written style
• 마셨네 = the speaker is noticing or reacting to the fact

That matches the tone of this sentence well, because the speaker seems to be observing something and drawing a conclusion from it.

-나 봐 means the speaker is guessing or inferring something based on evidence.

So 많이 더웠나 봐 means:

• It must have been very hot.
• I guess it was pretty hot.
• She must have been really hot.

The speaker is not stating a confirmed fact. Instead, they are making a reasonable guess from what they observed: she drank two whole cups of tomato juice.

Because the speaker is inferring a past situation from a present observation.

The logic is:

1. She drank a lot of tomato juice.
2. Therefore, it must have been hot.

So 더웠나 봐 refers to the earlier condition that explains her drinking so much.

If you said 덥나 봐, that would suggest:

• It must be hot (now).

But 더웠나 봐 means:

• It must have been hot.

Yes, 많이 often means a lot, but it can also work like very / quite in everyday speech, especially with words describing states or conditions.

So 많이 더웠나 봐 means:

• It must have been very hot.
• It seems it was quite hot.

This is a very natural colloquial use.

It can be understood a little broadly, and that is normal in Korean.

덥다 can describe:

• the weather/environment being hot
• a person feeling hot

So in this context, 많이 더웠나 봐 could be understood as:

• It must have been very hot.
• She must have been feeling very hot.

Both fit the situation, and Korean often leaves that kind of subject unstated when it is easy to infer from context.

Using two short sentences makes the thought process feel natural and conversational:

1. 그녀는 토마토 주스를 두 컵이나 마셨네.
2. 많이 더웠나 봐.

This has a nice spoken flow:

• first, the speaker notices a fact
• then, the speaker makes an inference

A longer combined sentence would also be possible, but the two-sentence version feels very natural for casual observation.

Yes. 토마토 주스 works as one noun phrase meaning tomato juice.

Then the object marker is attached to the whole phrase by going on the final noun:

• 토마토 주스 + 를 → 토마토 주스를

This is very common in Korean noun phrases. Only the last noun in the phrase gets the particle.

It can, depending on tone and context, but not necessarily.

-이나 simply shows the amount feels notable to the speaker. That could be:

• surprise
• admiration
• mild judgment
• simple observation

In this sentence, the follow-up 많이 더웠나 봐 makes it sound more like a natural explanation than criticism. It feels more like:

• Wow, she drank a lot. It must have been really hot.

rather than a negative judgment.