Tôi nghe nói khách sạn đó rất sạch.

Vietnamese often does not use a verb like to be when linking a noun to an adjective.

So in khách sạn đó rất sạch:

• khách sạn đó = that hotel
• rất sạch = very clean

Together, it naturally means that hotel is very clean.

This is very common in Vietnamese:

• Cô ấy đẹp. = She is beautiful.
• Phòng này rộng. = This room is spacious.

Nghe nói means to hear that, to hear it said that, or to have heard that.

It usually introduces information you heard from other people, not something you know directly.

So Tôi nghe nói khách sạn đó rất sạch means:

• I heard that hotel is very clean
• I've heard that hotel is very clean

It often carries a slight hearsay sense: you are passing on information, not guaranteeing it from personal experience.

It can mean either, depending on context.

Vietnamese verbs do not change form for tense the way English verbs do. So nghe nói by itself does not mark past or present.

That means Tôi nghe nói khách sạn đó rất sạch could be understood as:

• I hear that that hotel is very clean
• I heard that that hotel is very clean
• I've heard that that hotel is very clean

If you want to make the time clearer, Vietnamese can add time words such as:

• hôm qua = yesterday
• rồi = already
• đang = in progress

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

So:

• khách sạn đó = that hotel
• nhà này = this house
• người kia = that person over there

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

Đó here means that.

So khách sạn đó = that hotel.

It points to a specific hotel that is already known in the conversation or context.

Vietnamese has several demonstratives, including:

• này = this
• đó = that
• kia = that over there / that one farther away

In everyday speech, đó is very common for that.

Rất means very, and in Vietnamese it comes before the adjective.

So:

• rất sạch = very clean
• rất đẹp = very beautiful
• rất tốt = very good

This is similar to English word order:

• very clean
• very nice

Without rất, khách sạn đó sạch simply means that hotel is clean.

Sạch basically means clean.

In this sentence, it describes the hotel as physically clean.

Common uses:

• phòng sạch = a clean room
• nhà sạch = a clean house
• quần áo sạch = clean clothes

Depending on context, sạch can sometimes extend to ideas like being clear, free of dirt, or thoroughly removed, but in this sentence it most naturally means ordinary physical cleanliness.

Yes, sometimes.

Vietnamese often omits pronouns when the subject is obvious from context. So in conversation, someone might simply say:

• Nghe nói khách sạn đó rất sạch.

This still means I heard that hotel is very clean or more generally They say that hotel is very clean depending on context.

However, tôi is useful when:

• you want to be explicit
• you want to sound clearer
• you are writing carefully
• the subject is not obvious

Yes.

• nghe = to hear / to listen
• nghe nói = to hear that / to hear people say

Examples:

• Tôi nghe tiếng nhạc. = I hear music.
• Tôi nghe nói anh ấy rất giàu. = I heard that he is very rich.

So nghe nói is a set expression often used for reported information.

Yes, often you can.

Both ấy and đó can refer to that. In many situations they are close in meaning.

• khách sạn đó
• khách sạn ấy

Both can mean that hotel.

That said, there can be small differences in tone, region, or context. đó is extremely common and very safe to use. For many learners, khách sạn đó is the easiest default choice.

A careful approximation is:

• Tôi ≈ toy
• nghe ≈ ngeh
• nói ≈ noy
• khách sạn ≈ khak सन / khak san with Vietnamese tones
• đó ≈ daw / doh with a rising tone
• rất ≈ zut / rut with a short, clipped ending
• sạch ≈ sahk with a clipped ending

A more useful learner note is the tone pattern:

• Tôi: level-ish
• nói: rising
• sạn: heavy/falling glottalized tone
• đó: rising
• rất: broken/glottalized tone
• sạch: heavy, clipped tone

Exact pronunciation depends on dialect, especially North vs South. If you want, I can also break the whole sentence down syllable by syllable with tone notes.

Yes, it is very natural.

Tôi nghe nói khách sạn đó rất sạch is a normal, everyday way to say that you have heard the hotel is very clean.

It sounds conversational and neutral. It would fit well in contexts like:

• talking about travel plans
• discussing accommodation
• giving secondhand information

Yes, very often.

Because of nghe nói, the sentence usually suggests that your information is secondhand. You heard it from someone else, from reviews, from friends, or from general talk.

So it often implies:

• you do not know from direct experience
• you are reporting what you heard

If you had stayed there yourself, you would more naturally say:

• Khách sạn đó rất sạch. = That hotel is very clean.
• Tôi thấy khách sạn đó rất sạch. = I found that hotel very clean / I think that hotel is very clean from what I saw.

Not much, if you want the same natural meaning.

The normal structure is:

• Tôi = subject
• nghe nói = heard that
• khách sạn đó = that hotel
• rất sạch = very clean

So: Tôi nghe nói khách sạn đó rất sạch.

If you move words around freely, it may sound unnatural or change the meaning. Vietnamese word order is quite important, especially with:

• demonstratives after nouns
• adverbs like rất before adjectives
• topic-comment structure

So this sentence is already in a very standard order.