Bộ phim này rất buồn.

Yes, phim already means movie/film.

In bộ phim, the word bộ is a classifier-like word often used for complete works such as films, books, or TV series. So:

• phim = film/movie
• bộ phim = the film / a movie / a film work

In everyday speech, people often just say phim này rất buồn and it sounds completely natural too.

So:

• Bộ phim này rất buồn. = slightly fuller/more formal
• Phim này rất buồn. = very common and natural

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

So:

• bộ phim này = this movie
• literally: movie this

This is normal Vietnamese word order.

Compare:

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

So if you are thinking in English word order, this is one of the first things to get used to.

Rất means very.

So:

• buồn = sad
• rất buồn = very sad

It goes before the adjective, like many degree words in Vietnamese:

• rất đẹp = very beautiful
• rất khó = very difficult
• rất hay = very good / very interesting

So the structure here is:

• bộ phim này = this movie
• rất buồn = is very sad

Vietnamese often does not use a verb like to be in sentences with adjectives.

In English, you say:

• The movie is sad.

In Vietnamese, you simply say:

• Bộ phim này buồn.

And if you want to strengthen it:

• Bộ phim này rất buồn.

So the pattern is often:

• noun + adjective

Examples:

• Cô ấy đẹp. = She is beautiful.
• Trời nóng. = The weather is hot.
• Bài này khó. = This lesson is difficult.

This is very normal in Vietnamese.

Usually Bộ phim này rất buồn means This movie is very sad, in the sense that it has a sad story, sad mood, or sad content.

It can also imply that watching it makes people feel sad, but the sentence is describing the movie, not directly your personal feeling.

If you want to say I feel sad because of this movie, you would say something more like:

• Xem bộ phim này tôi rất buồn. = Watching this movie makes me very sad.
• Bộ phim này làm tôi buồn. = This movie makes me sad.

So the original sentence is mainly a description of the film.

Yes, absolutely.

• Bộ phim này rất buồn.
• Phim này rất buồn.

Both are natural.

Using bộ phim can sound a bit more complete or slightly more formal, while phim is shorter and very common in everyday speech.

This is a great question, because learners often confuse emotional sad with boring.

Buồn mainly means sad.

So:

• Bộ phim này rất buồn. = This movie is very sad.

If you want to say boring, Vietnamese usually uses:

• chán

So:

• Bộ phim này rất chán. = This movie is very boring.

There is also an expression buồn tẻ, which can mean dull / уныinteresting / monotonous, but in this sentence buồn by itself is understood as sad, not boring.

A rough English-friendly guide is:

• Bộ ≈ boh with a falling-glottal kind of tone
• phim ≈ feem
• này ≈ nye with a falling tone
• rất ≈ somewhat like zut or ruht, depending on accent
• buồn ≈ boo-uhn with a falling tone

A few important pronunciation notes:

• ph in Vietnamese sounds like f
• nh is like the ny sound in canyon or piñata
• tones matter a lot, especially on bộ, này, rất, and buồn

If you want a simple rhythm, try saying it in chunks:

• bộ phim này / rất buồn

The pattern is:

• noun phrase + degree word + adjective

So here:

• Bộ phim này = noun phrase (this movie)
• rất = degree word (very)
• buồn = adjective (sad)

So the full structure is:

• Bộ phim này rất buồn.
• This movie is very sad.

This is a very common Vietnamese sentence pattern.

Yes.

• Bộ phim này buồn. = This movie is sad.
• Bộ phim này rất buồn. = This movie is very sad.

Removing rất just makes the statement less strong.

In casual speech, Vietnamese sometimes likes to include a degree word, so rất is very common, but grammatically it is not required.

Yes, you can.

• Bộ phim này rất buồn. = This movie is very sad.
• Bộ phim này buồn lắm. = This movie is so sad / very sad.

Lắm often adds a more emotional or conversational feeling. It can sound more expressive and natural in speech.

Very roughly:

• rất buồn = neutral, straightforward very sad
• buồn lắm = more feeling, emphasis, sometimes like so sad

Both are correct; they just feel a little different in tone.

It is basically neutral.

• Bộ phim này rất buồn. sounds natural and standard.
• It is fine in conversation, writing, or classroom examples.

If you want something more casual, you might hear:

• Phim này buồn quá. = This movie is so sad.
• Phim này buồn ghê. = This movie is really sad.

But the original sentence is a very good standard model for learners.

Yes. That is one of the most important things to notice here.

In Vietnamese, adjectives can function like predicates without needing to be. So:

• Bộ phim này rất buồn. = This movie is very sad.
• Căn phòng này lớn. = This room is big.
• Món này ngon. = This dish is delicious.

So if you are translating word-for-word from English, remember that Vietnamese often does not need an extra linking verb.