Tôi hỏi về phí này.

Tôi means I in a neutral, polite way. It is one of the safest pronouns for learners to use.

However, Vietnamese pronouns depend a lot on the relationship between speakers. In real life, people often use other words instead of tôi, such as:

• mình – softer, more personal in some contexts
• em – used by a younger person speaking to someone older
• anh / chị – sometimes used by the speaker to refer to themself, depending on age and social role

So tôi hỏi về phí này is grammatically fine and neutral, but in everyday conversation, another pronoun might sound more natural depending on who is speaking.

Hỏi means to ask.

In this sentence, it is followed by về, so hỏi về means ask about or inquire about.

• hỏi = ask
• hỏi về = ask about / ask regarding

So the structure is:

• Tôi hỏi về phí này.
• literally: I ask about this fee.

Without về, hỏi usually needs a direct object, such as:

• Tôi hỏi anh ấy. = I ask him.
• Tôi hỏi một câu. = I ask a question.

With a topic, về is very common:

• hỏi về giá = ask about the price
• hỏi về khóa học = ask about the course

Here, về means about, regarding, or concerning.

It introduces the topic of the question. So:

• hỏi về phí này = ask about this fee

This is a very common Vietnamese pattern:

• nói về... = talk about...
• nghĩ về... = think about...
• hỏi về... = ask about...

So về is not the main verb. It is a preposition-like word showing the topic.

Phí means fee, charge, or cost in the sense of a specific imposed payment.

It is not exactly the same as giá or tiền:

• phí = fee, charge
  
  • examples: service fee, shipping fee, tuition fee
• giá = price
• tiền = money, amount of money

For example:

• phí dịch vụ = service fee
• giá vé = ticket price
• tiền học = tuition money / school fees in a broader sense

So phí này means this fee/charge, not just this money or this price.

In Vietnamese, demonstratives like này usually come after the noun.

So:

• phí này = this fee
• cuốn sách này = this book
• người này = this person

This is different from English, where this comes before the noun.

A very common learner mistake is trying to put này first. In normal Vietnamese word order, it comes after the noun.

You do not have to use a classifier here, so phí này is acceptable.

However, khoản phí này can sound a bit more specific or formal. Khoản is often used for sums of money, fees, expenses, or financial items.

Compare:

• phí này = this fee
• khoản phí này = this fee / this charge / this fee amount

Using khoản can make the phrase sound more precise, especially in formal or business contexts.

So both can work, but:

• phí này = simpler
• khoản phí này = more explicit/formal

Vietnamese verbs do not change form for tense the way English verbs do. So hỏi by itself does not automatically tell you whether the action is present, past, or future.

Because of that, Tôi hỏi về phí này can depend on context.

In isolation, many learners will read it as something like:

• I ask about this fee
• or I am asking about this fee

But in the right context, it could also be understood as:

• I asked about this fee

If you want to make time clearer, Vietnamese often adds time words or aspect markers:

• Tôi đã hỏi về phí này. = I asked about this fee.
• Tôi đang hỏi về phí này. = I am asking about this fee.
• Tôi sẽ hỏi về phí này. = I will ask about this fee.

So the basic sentence does not mark tense strongly on its own.

It is grammatical, but by itself it may sound a little incomplete or context-dependent.

In real conversation, Vietnamese speakers often say something more specific, such as:

• Tôi muốn hỏi về phí này. = I want to ask about this fee.
• Tôi hỏi về khoản phí này. = I am asking about this fee.
• Cho tôi hỏi về phí này. = Let me ask about this fee / May I ask about this fee?

Why? Because Tôi hỏi về phí này can sound a bit bare, almost like a simple statement of action: I ask about this fee.

So it is fine for learning grammar, but in everyday speech, a slightly fuller sentence may sound more natural.

Vietnamese does not have articles like a, an, and the in the same way English does.

Whether something is definite or not is usually understood from context, word order, or words like này (this) and đó (that).

So:

• phí này already means this fee
• there is no need for a separate word meaning the

In other words, Vietnamese does not translate English word-for-word here.

Normally, Tôi hỏi phí này would sound unnatural if you mean I ask about this fee.

That is because hỏi usually needs either:

1. a person/object directly
   
   • Tôi hỏi cô ấy. = I ask her.

or

2. a topic introduced by về
   
   • Tôi hỏi về phí này. = I ask about this fee.

So if your meaning is ask about this fee, you should keep về.

A rough Northern-style pronunciation is:

• Tôi ≈ toy
• hỏi ≈ something like hoy with a dipping-rising tone
• về ≈ veh with a falling tone
• phí ≈ fee with a rising tone
• này ≈ nye or nai depending on accent, with a level tone

The tones matter a lot:

• hỏi has the hỏi tone
• phí has the sắc tone
• về has the huyền tone
• này has the ngang tone

Even if your consonants and vowels are good, wrong tones can make the word hard to understand, so this is a sentence worth practicing aloud slowly.

The word order is:

• Tôi = subject
• hỏi = verb
• về phí này = prepositional phrase showing the topic

So the structure is:

Subject + Verb + about + Noun

More literally:

• Tôi = I
• hỏi = ask
• về = about
• phí này = this fee

This is one reason the sentence is fairly easy for English speakers: the overall order is not too different from I ask about this fee, except that this comes after the noun in Vietnamese.