Aku beneran minta maaf karena lupa membalas pesan tadi malam.

I’m really sorry because I forgot to reply to the message last night.

Breakdown of Aku beneran minta maaf karena lupa membalas pesan tadi malam.

• sebuah: a
• karena: because
• tadi malam: last night
• lupa: to forget
• pesan: the message
• membalas: to reply
• aku: I
• minta maaf: to apologize
• beneran: really

Questions & Answers about Aku beneran minta maaf karena lupa membalas pesan tadi malam.

Why does it use aku instead of saya? Which one should I use?

Aku is the informal, personal I (common with friends, partners, close colleagues, and in casual texting). Saya is more neutral/formal and safer for strangers, customers, elders, or professional contexts.
This sentence feels like a casual apology message, so aku fits. A more formal version would be Saya benar-benar minta maaf karena lupa membalas pesan tadi malam.

What does beneran mean, and is it different from benar-benar?

Beneran is a casual form of benar-benar, meaning really / genuinely / seriously.

• Casual: Aku beneran minta maaf…
• More standard: Aku benar-benar minta maaf…
  In speech and texting, beneran is very common.

Why is it minta maaf (literally “ask for forgiveness”)? Can I just say maaf?

Both are natural, but they feel different:

• Maaf = a short sorry / excuse me (often used alone: Maaf ya.)
• (Saya/Aku) minta maaf = I apologize / I’m asking for your forgiveness, more explicit and a bit “heavier.”
  Adding beneran/benar-benar makes it even more heartfelt: I’m really sorry.

What does karena do here? Can it be replaced with soalnya?

Karena means because and introduces the reason clause: because (I) forgot…
Soalnya also means because, but it’s more conversational and often feels like an explanation you add on:

• Aku minta maaf karena lupa… (neutral/standard)
• Aku minta maaf, soalnya lupa… (more chatty, “it’s because I forgot…”)

Why is there no subject in lupa membalas pesan? Who forgot?

Indonesian often drops the subject when it’s clear from context. After Aku … karena, it’s understood that the subject stays the same:
Aku … karena (aku) lupa membalas pesan…
You can include it, but it’s not necessary and can sound a bit repetitive.

How does lupa work with verbs? Why lupa membalas and not something like “forgot to replied”?

Lupa commonly works like forget to + verb:

• lupa + verb (often with meN-): lupa membalas = forgot to reply
• You can also see lupa untuk membalas (more explicit: forgot to reply)
  So lupa membalas pesan is a normal, compact structure.

What’s the function of the prefix meN- in membalas?

meN- is a common verb-forming prefix. Here:

• base: balas = reply / return (a response)
• verb: membalas = to reply (to something)
  In Indonesian, many active transitive verbs use meN-.

Could I say lupa balas pesan without mem-?

Yes, in casual speech/texting, people often drop the prefix:

• Casual: Aku lupa balas pesan tadi malam.
• More standard: Aku lupa membalas pesan tadi malam.
  Keeping membalas sounds more complete/standard; dropping it sounds more informal.

Is membalas pesan the same as membalas chat or menjawab pesan?

They’re related, with slight nuance:

• membalas pesan/chat = reply to a message/chat (very common for texting)
• menjawab pesan = answer a message (possible, but membalas is more idiomatic for messaging)
• membalas strongly implies “reply back,” which fits messaging well.

What exactly does tadi malam mean? Is it always “last night”?

Tadi malam means last night (the most recent night that just passed). It typically refers to last night relative to “now,” especially when speaking today.
If you want to be more explicit about timing, you can also say semalam (also “last night,” depending on region/context) or specify a day: malam Jumat (Thursday night).

Is the word order fixed? Can I move tadi malam earlier?

It’s flexible. Time expressions can move around without changing the core meaning:

• … lupa membalas pesan tadi malam. (very natural)
• … lupa tadi malam membalas pesan. (possible, but slightly heavier)
• Tadi malam aku lupa membalas pesan. (emphasizes the time: “Last night, I forgot…”)