Ừ, tôi rảnh.

Ừ is an informal way to say yes, yeah, or uh-huh.

In Ừ, tôi rảnh., it sets the tone as something like:

• Yeah, I’m free.
• Yes, I’m available.

It is casual and natural in conversation. You would usually use it with friends, family, or in relaxed situations.

Not especially. Ừ is casual.

With people you want to be more polite toward, you would more often say:

• Vâng — polite, often used in the north
• Dạ — polite, very common in the south, often before answering
• Dạ, tôi rảnh.
• Vâng, tôi rảnh.

So Ừ, tôi rảnh. sounds friendly and informal, not rude by itself, but not ideal for formal situations.

Tôi means I.

It is a neutral, fairly safe pronoun for learners, especially when you do not know what other pronoun to use. However, in real Vietnamese conversation, people often use kinship-style pronouns or relationship-based words instead of tôi.

For example, depending on who is speaking, a native speaker might say:

• Mình rảnh.
• Anh rảnh.
• Em rảnh.
• Con rảnh.

So tôi is correct, but it can sound slightly formal or neutral depending on the situation.

Rảnh means free, available, or not busy.

In this sentence, tôi rảnh means:

• I’m free.
• I’m available.
• I have free time.

It usually refers to time or schedule, not freedom in a political or philosophical sense.

For example:

• Hôm nay tôi rảnh. — I’m free today.
• Chiều nay tôi rảnh. — I’m free this afternoon.

Vietnamese often does not use a verb like to be in sentences with adjectives.

In English, you say:

• I am free.

In Vietnamese, you simply say:

• tôi rảnh

Here, rảnh works like an adjective meaning free/available, and no equivalent of am is needed.

This is very common in Vietnamese:

• Tôi mệt. — I’m tired.
• Cô ấy đẹp. — She’s beautiful.
• Anh bận. — He’s busy.

Ừ can be tricky for English speakers.

A rough guide:

• It has the vowel ư, which does not exist in English.
• The tone is low and falling.

The vowel ư is pronounced with the tongue somewhat like for ee, but with the lips relaxed, not spread strongly. It is different from u.

If you cannot produce it perfectly yet, that is normal. The important thing is to learn to distinguish:

• u
• ư

because they are different vowels in Vietnamese.

Also, Ừ is usually said very naturally and casually, almost like a short response sound.

Rảnh is also a little challenging.

A few things to notice:

• r in Vietnamese does not sound exactly like English r
• ảnh has the vowel cluster ảnh
• the word has a tone mark

Depending on the dialect:

• In the north, r may sound somewhat like a z sound in English
• In the south, it may sound more like an English r or a softer sound depending on the speaker

So learners may hear different pronunciations in real life.

The most important thing is to learn it as one whole word meaning free/available, and then improve the pronunciation over time.

Sometimes, yes.

In conversation, Vietnamese often drops subjects when they are obvious from context. So if someone asks you:

• Bạn có rảnh không? — Are you free?

you could answer simply:

• Rảnh. — Free. / I am.
• Ừ, rảnh. — Yeah, I am.

This sounds natural in casual speech. Including tôi makes the sentence more complete, but in everyday conversation it is often omitted.

They are opposites in this context:

• rảnh = free / available
• bận = busy

So:

• Tôi rảnh. — I’m free.
• Tôi bận. — I’m busy.

A very common question is:

• Bạn có rảnh không? — Are you free?

And possible answers are:

• Ừ, tôi rảnh.
• Không, tôi bận.

The comma shows a short pause.

In speech, Ừ functions like a separate response word, and then the speaker adds the full statement:

• Ừ, tôi rảnh. — Yeah, I’m free.

Without the comma, the meaning would still be understandable, but the comma reflects the natural pause in writing.

Yes, depending on context.

Tôi rảnh can suggest:

• I’m free
• I’m available
• I’m not busy
• I have time

The exact English translation depends on the situation.

For example:

• If someone asks whether you can meet, it means I’m available.
• If someone asks whether you are busy, it can mean I’m not busy.

Yes. Depending on the relationship and region, a native speaker might say:

• Ừ, mình rảnh.
• Ừ, em rảnh.
• Ừ, anh rảnh.
• Dạ, em rảnh ạ. — more polite
• Có, tôi rảnh. — Yes, I’m free

So Ừ, tôi rảnh. is correct and understandable, but not the only natural version. The most natural pronoun depends on who is speaking to whom.