Laporan itu pasti milik dia, bukan saya punya.

Laporan = report
Itu = that / the

In Malay, demonstratives like itu (that) usually come after the noun:

• laporan itu = that report / the report
• buku itu = that book
• orang itu = that person

So “laporan itu” is literally report that, but it means “that report” or “the report” in natural English. This is normal Malay word order for “that X / the X”.

Pasti means “definitely / certainly / surely”.

In “Laporan itu pasti milik dia”, pasti is an adverb of certainty modifying the predicate milik dia:

• Laporan itu milik dia. = The report belongs to him/her.
• Laporan itu pasti milik dia. = The report definitely belongs to him/her.

You usually place pasti before the part it modifies:

• Dia pasti datang. = He/She will definitely come.
• Mereka pasti tahu. = They definitely know.

Milik is a noun/relational word meaning “ownership / property / belonging”.

Structure: milik + pronoun/noun = the possession of X / belonging to X

So:

• milik dia = his/her property / belonging to him/her
• milik saya = my property / belonging to me
• milik syarikat = the company’s property

In the sentence:

• Laporan itu pasti milik dia
  literally: That report is definitely (the) belonging of him/her
  natural English: “That report definitely belongs to him/her.”

So milik dia functions like “belongs to him/her” or “his/hers (as owner)”.

Dia is a third-person singular pronoun that covers both “he” and “she”.

Malay does not normally mark gender in pronouns:

• dia = he / she
• milik dia = his / hers
• kawan dia = his friend / her friend

The gender is understood from context, not from the word itself.

In more formal or respectful contexts, you might also see:

• beliau = respectful “he/she” (for people you respect, like teachers, officials)
  • Laporan itu pasti milik beliau.

But gender is still not marked; beliau is also gender-neutral.

Malay has two main negators: bukan and tidak.

• bukan negates nouns, pronouns, and equational statements (X is Y).
• tidak negates verbs and adjectives.

Examples:

• Ini bukan buku saya. = This is not my book. (noun)
• Dia bukan doktor. = He/She is not a doctor. (noun)
• Dia tidak datang. = He/She did not come. (verb)
• Dia tidak penat. = He/She is not tired. (adjective)

In “bukan saya punya”:

• saya punya is functioning as a noun phrase meaning mine.
• So you need bukan, not tidak.

“Tidak saya punya” would be ungrammatical.

Punya is a word related to possession. In this structure:

• saya = I / me
• saya punya = literally my possession → functionally “mine”

So “bukan saya punya” means “not mine”.

Some common patterns:

• Ini buku saya. = This is my book.
• Ini bukan buku saya, ini buku dia. = This isn’t my book, it’s his/hers.
• Ini saya punya. = This is mine.
• Itu bukan saya punya. = That is not mine.

In your sentence, the noun laporan (report) is understood from context, so people just say:

• …, bukan saya punya.
  ≈ …, it’s not mine.

More formal equivalent: “bukan milik saya” = not my property / not mine.

Malay commonly drops repeated nouns when they’re obvious from context.

Full, explicit version:

• Laporan itu pasti milik dia, bukan laporan saya.
  = That report definitely belongs to him/her, not my report.

Natural, shorter version:

• Laporan itu pasti milik dia, bukan saya punya.
  = That report definitely belongs to him/her, not mine.

The listener already knows you’re talking about “laporan”, so it’s omitted. English does something similar:

• That report is definitely his, not mine.
  (You don’t repeat “report” either.)

“Saya punya” is colloquial / neutral spoken Malay. It’s very common in everyday speech and informal writing.

The sentence:

• Laporan itu pasti milik dia, bukan saya punya.

feels like neutral conversational Malay, not very formal but not slang either.

A more formal version would avoid punya and use milik both times, and maybe beliau:

• Laporan itu pasti milik beliau, bukan milik saya.
  = That report definitely belongs to him/her, not to me.

So:

• Talking to friends/colleagues: current sentence is fine.
• Writing a formal report/letter: prefer “bukan milik saya”.

Yes, you can drop pasti:

• Laporan itu milik dia, bukan saya punya.
  = That report belongs to him/her, not mine.

Difference:

• With pasti → you are expressing certainty / strong confidence:
  • “That report definitely belongs to him/her…”
• Without pasti → neutral statement of fact:
  • “That report belongs to him/her…”

Grammatically, both are correct; pasti just adds the nuance of certainty.

Yes, you can say:

• Laporan itu pasti dia punya.
  ≈ That report is definitely his/hers.

Difference in feel:

1. milik dia

   • Slightly more formal / standard.
   • Focuses on ownership in a more “textbook” way.
   • Suitable in written or semi-formal contexts.

2. dia punya

   • More colloquial / conversational.
   • Very common in speech.
   • Sounds a bit more relaxed.

Meaning-wise, they both say that the report belongs to him/her. In a fully colloquial version, you might have:

• Laporan itu pasti dia punya, bukan saya punya.

In a more formal version:

• Laporan itu pasti milik dia, bukan milik saya.

Yes, the sentence is structured as a contrast between two ownership claims:

1. Laporan itu pasti milik dia,
   = That report definitely belongs to him/her,

2. bukan saya punya.
   = (and) not mine.

So the pattern is:

• [Statement A], bukan [Statement B].

This is very common in Malay for contrast:

• Ini untuk kamu, bukan untuk saya.
  = This is for you, not for me.

• Dia orang Malaysia, bukan orang Indonesia.
  = He/She is Malaysian, not Indonesian.

In your sentence, bukan negates the implied “…laporan itu (adalah) saya punya” → “the report is mine”.