Jika kamu lupa membawa kartu identitas, maka kamu harus mengisi formulir lagi.

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Breakdown of Jika kamu lupa membawa kartu identitas, maka kamu harus mengisi formulir lagi.

• jika: if
• harus: have to
• lupa: to forget

Questions & Answers about Jika kamu lupa membawa kartu identitas, maka kamu harus mengisi formulir lagi.

Why does the sentence start with Jika? Is it the same as kalau?

Jika introduces a conditional clause (if-clause). It’s often slightly more formal/written than kalau, but in many everyday situations they’re interchangeable:

• Jika kamu lupa... = Kalau kamu lupa...
  In more formal announcements/instructions, jika is very common.

What’s the function of maka here? Do I have to use it?

Maka roughly signals then and marks the result clause more explicitly: If X, then Y.
It’s optional in many cases:

• Jika kamu lupa membawa kartu identitas, kamu harus mengisi formulir lagi. (still correct) Using maka can make the cause→effect structure feel clearer or more formal.

Why is kamu repeated twice? Can I drop the second one?

Indonesian often repeats the subject for clarity, especially when the first clause is long. You can omit the second kamu if it’s clear:

• Jika kamu lupa membawa kartu identitas, (maka) harus mengisi formulir lagi.
  However, that version can sound a bit more “instruction-like” and slightly less natural in some contexts. Repeating kamu is very normal.

Is kamu always appropriate? What are other options?