Мне так нравится этот фильм.

Because Russian uses нравиться differently from English to like.

Literally, Мне так нравится этот фильм is closer to:

• This film is so pleasing to me

So:

• мне = to me / for me (dative case)
• not я = I (nominative)

With нравиться, the person who experiences the feeling is usually in the dative.

Examples:

• Мне нравится музыка. = I like the music.
• Ему нравится эта книга. = He likes this book.

Because with нравиться, the thing that is liked is the grammatical subject of the sentence.

So in:

• Мне так нравится этот фильм

the subject is:

• этот фильм = this film

That is why it stays in the nominative.

This is different from English, where I is the subject in I like this film. In Russian, the structure is more like:

• This film pleases me

So:

• мне = experiencer, in dative
• этот фильм = subject, in nominative

Because it agrees with этот фильм, which is singular.

Russian verbs in the present tense agree with the subject in number and person. Since:

• этот фильм = singular

the verb is:

• нравится = third person singular

Compare:

• Мне нравится этот фильм. = I like this film.
• Мне нравятся эти фильмы. = I like these films.

In the second sentence, фильмы is plural, so the verb becomes нравятся.

Here так means so, so much, or a lot.

So the sentence means something like:

• I like this film so much
• I like this film a lot

Without так, the sentence would simply be:

• Мне нравится этот фильм. = I like this film.

Adding так makes it more emotional or emphatic.

Be aware that так can also mean in this way or like this in other contexts, but here it is an intensifier.

Because the verb is not agreeing with me. It is agreeing with этот фильм.

In English, we say:

• I like the film

so it feels natural to expect the verb to match I.

But in Russian, the pattern is different:

• Мне нравится фильм
  literally: To me, the film is pleasing

So the verb stays in third person singular because the subject is film, not I.

That is why you get:

• мне нравится фильм
• тебе нравится фильм
• ему нравится фильм

The person changes, but the verb stays нравится as long as the thing liked is singular.

Yes, нравиться is a verb with -ся, often called a reflexive form.

For learners, the best approach is to treat нравиться as a whole vocabulary item meaning:

• to be pleasing
• to appeal to
• to be liked

In this verb, -ся is just part of the standard form you need to learn. You do not need to translate it literally every time.

So memorize patterns like:

• Мне нравится...
• Тебе нравится...
• Им нравятся...

rather than trying to build the meaning from English word by word.

This is a very common question.

нравиться

Usually means:

• to like
• to find pleasing
• to appeal to someone

Example:

• Мне нравится этот фильм. = I like this film.

любить

Usually means:

• to love
• sometimes to like doing something regularly
• sometimes to be fond of

Examples:

• Я люблю этот фильм. = I love this film.
• Я люблю читать. = I like/love reading.
• Я люблю кофе. = I like/love coffee.

So in many contexts:

• нравиться = weaker / more neutral
• любить = stronger, more emotional, or sometimes more habitual

In this sentence, нравится sounds natural for giving your opinion about the film.

Yes. Russian word order is flexible because the case endings show the roles of the words.

The neutral sentence is:

• Мне так нравится этот фильм.

But you could also hear:

• Этот фильм мне так нравится.
• Мне этот фильм так нравится.

These versions are all grammatical, but they shift emphasis slightly:

• Этот фильм мне так нравится puts more focus on this film
• Мне этот фильм так нравится can sound more conversational or contrastive

So the meaning stays basically the same, but the emphasis changes.

Yes.

• Мне нравится этот фильм. = I like this film.
• Мне так нравится этот фильм. = I like this film so much / I like this film a lot.

So так is optional here. It adds emphasis, emotion, or intensity.

If you are just stating a simple opinion, leaving it out is completely normal.

You simply add не before the verb:

• Мне не нравится этот фильм. = I do not like this film.

The structure stays the same:

• мне = dative experiencer
• этот фильм = nominative subject
• не нравится = does not please / is not liked

For plural:

• Мне не нравятся эти фильмы. = I do not like these films.