Bộ phim này rất dài.

In Vietnamese, demonstratives like này (this) usually come after the noun, not before it.

So:

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

This is a very common pattern:

• người này = this person
• nhà này = this house
• cuốn sách này = this book

So the word order may feel reversed to an English speaker, but it is normal in Vietnamese.

Phim means film/movie and is often enough by itself.

Bộ phim is also very common and natural. In this expression, bộ is part of a fixed noun phrase meaning movie/film, especially when referring to a complete film as a work.

So both of these can work:

• Bộ phim này rất dài.
• Phim này rất dài.

The version with bộ phim can sound a bit fuller or slightly more formal, but both are natural.

Not exactly in the usual learner sense.

Vietnamese does use classifiers, but in bộ phim, bộ is best understood as part of a common noun expression rather than a simple standalone classifier like cái, con, or cuốn.

For learners, the easiest way to remember it is:

• phim = movie
• bộ phim = movie / film

So you do not need to overanalyze bộ every time you see this phrase.

Vietnamese often does not use a verb like English to be when describing something with an adjective.

So:

• Bộ phim này rất dài.
• literally: This movie very long.

That is a complete and correct sentence in Vietnamese.

This is a basic and important pattern:

• Cô ấy đẹp. = She is beautiful.
• Trời lạnh. = The weather is cold.
• Quyển sách này hay. = This book is interesting/good.

You do not say Bộ phim này là rất dài.

Rất means very. It goes before the adjective it modifies.

So:

• rất dài = very long

This same pattern appears everywhere:

• rất đẹp = very beautiful
• rất khó = very difficult
• rất nhanh = very fast

So the structure is:

noun + này + rất + adjective

In this sentence:

• bộ phim này = this movie
• rất dài = very long

It can mean both, depending on context.

Dài basically means long. In English, we also say a road is long and a movie is long. Vietnamese works similarly.

Examples:

• Con đường này dài. = This road is long.
• Bài hát này dài. = This song is long.
• Bộ phim này dài. = This movie is long.

With a movie, listeners naturally understand dài as referring to duration.

Yes. That is natural too, but the nuance is a little different.

• rất dài = very long
• dài lắm = very long / really long

Lắm often sounds a bit more expressive or conversational.

So:

• Bộ phim này rất dài. = neutral, straightforward
• Bộ phim này dài lắm. = more emphatic, a bit more spoken

Both are common.

By itself, it is neutral. It simply says the movie is very long.

Whether it sounds like praise, criticism, or just a fact depends on:

• tone of voice
• context
• facial expression
• what comes before or after

For example:

• If someone loves epic movies, rất dài may sound positive.
• If someone is tired or bored, it may sound negative.

So the grammar itself is neutral.

A rough guide is:

• Bộ — low-falling/heavy tone
• phim — level tone
• này — rising tone
• rất — sharp/glottalized tone
• dài — falling-rising tone

A very rough English-friendly approximation is:

• boh phim nai zut yai

But this is only approximate. The tones matter a lot in Vietnamese, so it is best to listen to native audio if possible.

Also note:

• ph in phim sounds like f
• dài in southern speech may sound different from northern speech because d pronunciation varies by region

Yes.

• Bộ phim này dài. = This movie is long.
• Bộ phim này rất dài. = This movie is very long.

So rất is optional. It just increases the strength of the description.

A common way is to add a question particle such as à, hả, or phải không depending on tone and formality.

Examples:

• Bộ phim này rất dài à? = Is this movie very long?
• Bộ phim này dài lắm hả? = Is this movie really long?
• Bộ phim này rất dài phải không? = This movie is very long, right?

In casual conversation, intonation also helps.

Use không before the adjective:

• Bộ phim này không dài. = This movie is not long.
• Bộ phim này không rất dài is not natural.

If you want not very long, say:

• Bộ phim này không dài lắm. = This movie is not very long.

So the pattern is:

• không + adjective

Sometimes, yes, depending on context.

In Vietnamese, speakers often omit words that are already understood. If everyone already knows which movie is being discussed, someone may simply say:

• Bộ phim rất dài.
• Phim dài quá.

But if you specifically want to say this movie, then này is the normal choice:

• Bộ phim này

So này is used when you want to point out a specific nearby or contextually immediate thing: this one.