Ẩm thực đường phố ở chợ đêm rất ngon.

A natural breakdown is:

• ẩm thực = cuisine, food, gastronomy
• đường phố = street
• ẩm thực đường phố = street food / street cuisine
• ở = at, in
• chợ đêm = night market
• rất = very
• ngon = delicious, tasty

So the structure is basically:

• [Street food] [at the night market] [very delicious]

One small nuance: ẩm thực can sound a bit broader or more formal than just food. It can suggest cuisine or food culture, not only individual dishes.

Because Vietnamese often does not use a copula like is/are before adjectives.

In English:

• The street food is delicious.

In Vietnamese:

• Ẩm thực đường phố ... rất ngon.

The adjective ngon can directly describe the subject without needing là.

So:

• Món này ngon. = This dish is delicious.
• Chợ đông. = The market is crowded.

A common learner mistake is to insert là before adjectives:

• ❌ Ẩm thực đường phố ở chợ đêm là rất ngon.

That sounds unnatural. Là is usually used with nouns, not with adjectives like ngon.

Vietnamese usually puts the main noun first and the describing word after it.

So:

• ẩm thực đường phố = cuisine/street → street food
• chợ đêm = market/night → night market

This is the opposite of normal English word order.

More examples:

• cà phê sữa = coffee milk → coffee with milk
• nhà hàng Ý = restaurant Italy → Italian restaurant
• xe đạp = vehicle pedal → bicycle

So in this sentence, both đường phố and đêm come after the main noun they modify.

Here ở marks location. It can often be translated as in, at, or sometimes from, depending on context.

In this sentence:

• ở chợ đêm = at the night market

That is probably the most natural English translation.

Other examples:

• Tôi ở nhà. = I am at home.
• Cô ấy làm việc ở Hà Nội. = She works in Hanoi.
• Chúng ta gặp nhau ở quán cà phê. = We meet at the café.

So ở is a very common and flexible location word.

Because in Vietnamese, words like very usually come before the adjective.

So:

• rất ngon = very delicious
• rất đẹp = very beautiful
• rất khó = very difficult

This is similar to English in meaning, but very important in word order:

• rất
  • adjective

You can also remove rất:

• Ẩm thực đường phố ở chợ đêm ngon.
• This still means the street food at the night market is delicious, just a little less emphatic.

It is understandable and natural, but it can sound a little broad or slightly formal.

Depending on context, Vietnamese speakers might also say:

• đồ ăn đường phố = street food
• món ăn đường phố = street dishes / street food

These often sound more like actual food items you eat.

So the differences are roughly:

• ẩm thực đường phố = street cuisine / street-food culture
• đồ ăn đường phố = street food in an everyday sense
• món ăn đường phố = street dishes

Your sentence is fine, but if you are talking casually about food you ate, many speakers might prefer đồ ăn đường phố ở chợ đêm rất ngon.

A rough syllable-by-syllable guide is:

• Ẩm — a short syllable with a dipping tone
• thực — low, heavy tone
• đường — falling tone
• phố — rising tone
• ở — dipping tone
• chợ — low, heavy tone
• đêm — level tone
• rất — sharp rising/checked tone
• ngon — level tone

A very rough English-style approximation might be:

• um thuk duh-uhng foh uh chuh dem zut ngon

But that is only approximate. Vietnamese pronunciation depends heavily on:

• vowel quality
• final consonants
• tones

A few tricky parts for English speakers:

• thực has the vowel ư, which does not exist in English
• ngon starts with ng-, which English speakers often find hard at the beginning of a word
• chợ and ở both have vowels that are not exact English matches

If you want to sound natural, it is better to learn the tones and vowels from audio rather than rely only on English spelling.

No. Vietnamese does not use articles like the and a/an the way English does, and nouns do not normally change form for plural.

So:

• chợ đêm can mean a night market or the night market
• ẩm thực đường phố can mean street food in a general sense

The exact meaning comes from context.

That is why the same Vietnamese sentence could be translated in different natural ways:

• Street food at the night market is very delicious.
• The street food at the night market is very tasty.

Vietnamese leaves that kind of detail to context more often than English does.

Yes, but it would sound more formal or written.

Compare:

• Ẩm thực đường phố ở chợ đêm rất ngon. → normal, everyday
• Ẩm thực đường phố tại chợ đêm rất ngon. → more formal, more written or official

For daily conversation, ở is usually the safer choice.

For a negative sentence, use không before the adjective:

• Ẩm thực đường phố ở chợ đêm không ngon.
• Street food at the night market is not delicious.

For a yes/no question, a very common pattern is có ... không or simply ... không:

• Ẩm thực đường phố ở chợ đêm có ngon không?
• Ẩm thực đường phố ở chợ đêm ngon không?

Both mean:

• Is the street food at the night market delicious?

The shorter ... ngon không? version is very common in speech.

By itself, it could be understood either way, depending on context.

• If you are already talking about a specific market, chợ đêm may mean the night market.
• If you are speaking generally, it can mean night markets as a type of place.

Vietnamese often leaves definiteness unstated unless it needs to be clarified.

If you wanted to be more specific, you could add more information:

• Ẩm thực đường phố ở chợ đêm Đà Lạt rất ngon.
  Street food at the Da Lat night market is very delicious.
• Ẩm thực đường phố ở chợ đêm này rất ngon.
  The street food at this night market is very delicious.