Bạn tớ đang thi.

Because bạn can mean either you or friend, depending on context.

In bạn tớ, the word tớ comes right after bạn and shows possession, so bạn tớ means my friend.

A useful pattern is:

• bạn = friend
• tớ = I / me / my (informal, among friends)
• bạn tớ = my friend

So in this sentence, bạn is a noun, not a pronoun.

Tớ is an informal first-person pronoun. It is commonly used between friends, classmates, or people of similar age and social level.

Depending on context, tớ can mean:

• I
• me
• my

In bạn tớ, it works like my.

Compared with other words:

• tớ = friendly, casual
• tôi = more neutral or formal
• mình = also common, depending on relationship and region

So bạn tớ sounds natural and friendly: my friend.

Both are possible, but bạn tớ is more natural and common in everyday speech.

In Vietnamese, with close relationships or familiar things, của is often omitted. So:

• bạn tớ = my friend
• bạn của tớ = my friend

The version with của is more explicit, but it can sound a little heavier or more formal in simple everyday sentences.

This omission is very common with words like:

• mẹ tôi = my mother
• anh ấy = his older brother / he
• bạn nó = his/her friend

Đang marks an action as being in progress. It is similar to English be + -ing.

So:

• thi = take an exam / sit an exam
• đang thi = be taking an exam right now

That means đang gives the sentence a progressive meaning: the action is happening at this moment or around this time.

Compare:

• Bạn tớ thi. = My friend takes/is taking an exam, depending on context
• Bạn tớ đang thi. = My friend is taking an exam right now

Vietnamese often relies on context, but đang makes the ongoing meaning clear.

Because Vietnamese does not build the progressive the same way English does.

In English, you need:

• My friend is taking an exam

In Vietnamese, the structure is more like:

• subject + đang + verb

So:

• Bạn tớ = my friend
• đang = in the middle of / currently
• thi = take an exam

There is no separate word equivalent to English is here.

This is very normal in Vietnamese.

Not always. Thi can have a few related meanings, depending on context.

Common meanings include:

• to take an exam
• to sit for an exam
• to compete
• to enter a contest

So context matters.

For example:

• đang thi could mean is taking an exam
• in another context, thi could mean is competing

If the meaning shown to the learner is my friend is taking an exam, then that is the intended meaning here.

The basic Vietnamese order here is:

• subject + aspect marker + verb

So:

• Bạn tớ = subject
• đang = aspect marker
• thi = verb

That gives:

• Bạn tớ đang thi.

This is the normal order.

If you rearrange the words, the sentence will usually sound wrong or unnatural to a learner-level speaker. So this is a good pattern to remember:

• Tôi đang học. = I am studying.
• Nó đang ngủ. = He/She is sleeping.
• Bạn tớ đang thi. = My friend is taking an exam.

Yes, it could, in the right context, because thi can mean compete as well as take an exam.

For example:

• In a school context, it probably means taking an exam.
• In a contest context, it could mean competing.

So the sentence itself is somewhat flexible, and context decides the exact meaning.

If you want to make the competition meaning clearer, Vietnamese often uses more specific expressions such as:

• thi đấu = compete in sports
• đi thi = go to take an exam / go compete, depending on context

It is very natural.

A Vietnamese speaker could absolutely say Bạn tớ đang thi in everyday conversation. It sounds casual, short, and normal.

It especially fits spoken Vietnamese because:

• tớ is informal and friendly
• bạn tớ is a very natural way to say my friend
• đang clearly shows the action is happening now

So this is a good example of everyday spoken Vietnamese.

Each word has its own tone:

• bạn — nặng tone
• tớ — sắc tone
• đang — level tone
• thi — level tone

Tones are important because changing the tone changes the word.

For example, ban, bán, bạn, and other tone variants are different words.

So when learning this sentence, it is worth practicing each word carefully rather than only memorizing the spelling.