Phí này đắt lắm.

Phí means fee, charge, or cost. It is commonly used for things like service fees, shipping fees, registration fees, and other official or fixed charges.

So Phí này means this fee or this charge.

A useful comparison:

• phí = fee/charge
• giá = price
• tiền = money / amount of money

In Vietnamese, demonstratives like this and that usually come after the noun.

So:

• phí này = this fee
• cái áo này = this shirt
• người đó = that person

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

Vietnamese often does not use a verb like to be when an adjective is the predicate.

So:

• Phí này đắt lắm. literally works like
• This fee expensive very.

But the natural English translation is:

• This fee is very expensive.
• This fee is really high.

This is a very common pattern in Vietnamese:

• Nhà này đẹp. = This house is beautiful.
• Món này ngon. = This dish is delicious.

Đắt means expensive or costly.

It is used for things that cost a lot:

• Cái túi này đắt. = This bag is expensive.
• Quán đó đắt lắm. = That restaurant is very expensive.

With phí, it means the fee is high or expensive.

Lắm is an intensifier. In this sentence, it means something like very, really, or a lot.

So:

• đắt = expensive
• đắt lắm = very expensive / really expensive

It often comes after the adjective:

• đẹp lắm = very beautiful
• khó lắm = very difficult
• xa lắm = very far

They are similar, but not exactly the same in tone.

• rất đắt = very expensive
• đắt lắm = very expensive / really expensive, often a bit more natural and expressive in speech

Both are correct.
Compare:

• Phí này rất đắt. = This fee is very expensive.
• Phí này đắt lắm. = This fee is really expensive.

Lắm often feels a little more conversational.

Yes. Phí này quá đắt is also correct, but the feeling is slightly different.

• đắt lắm = very expensive
• quá đắt = too expensive / extremely expensive

Quá often suggests a stronger reaction, sometimes even complaint:

• Phí này quá đắt. = This fee is too expensive.

So if you only want to say very expensive, đắt lắm is safer.

Yes, it is natural.

Phí này đắt lắm is a normal conversational way to say that a fee is very high.

Depending on context, Vietnamese speakers might also say:

• Phí này cao lắm.
• Mức phí này cao lắm.

Using cao can sound a bit more natural when talking about rates, fees, or prices in a more formal or factual way. But đắt lắm is still understandable and natural in everyday speech.

That is a common Vietnamese sentence pattern:

noun + demonstrative + adjective

So:

• Phí này đắt. = This fee is expensive.
• Nhà này lớn. = This house is big.
• Bộ phim này hay. = This movie is good.

Vietnamese does not need a separate word for is in this structure, so the adjective comes directly after the subject.

No. Phí does not normally need a classifier here.

Classifiers are common with many countable nouns, especially physical objects:

• cái bàn này = this table
• cuốn sách này = this book

But abstract nouns like phí usually do not take one in a basic sentence like this:

• Phí này đắt lắm.

A rough pronunciation guide is:

• Phí — rising tone
• này — low falling tone
• đắt — high rising tone, ending with a short t
• lắm — rising tone

Very roughly for English speakers:

• fee nay dat lum

But that spelling is only approximate. The tones matter a lot.

A few pronunciation notes:

• ph in Vietnamese sounds like f
• đ is like English d
• ă in đắt is a short vowel
• ă in lắm is also short

Yes, it depends on context.

Phí này can refer to whatever fee has already been mentioned or is obvious in the situation, such as:

• a service fee
• a delivery fee
• a tuition fee
• a registration fee

Vietnamese often relies on context, so the sentence can be complete even without naming the exact kind of fee again.

Often, yes.

Because đắt lắm is quite strong, it can sound like the speaker is reacting negatively:

• Phí này đắt lắm. = This fee is really expensive.

It does not always have to be a complaint, but in many real situations it suggests dissatisfaction or surprise.

If you want a more neutral tone, you might say:

• Phí này khá cao. = This fee is quite high.
• Phí này hơi cao. = This fee is a little high.