Sekarang semuanya sudah siap.

sekarang means now or at this moment. It’s an adverb of time. In Indonesian you can position time adverbs quite flexibly:

• Beginning (neutral/focused): Sekarang semuanya sudah siap.
• End (emphasis on timing): Semuanya sudah siap sekarang.

Both convey “Everything is ready now,” though front-placement is most common.

semua is the base word meaning all or every. Adding the enclitic -nya (→ semuanya) nominalizes it into “all of it” or “everything” as a single collective unit.

• Semua sudah siap (understandable, but reads more like “All are ready” without a clear noun phrase)
• Semuanya sudah siap (idiomatic: “Everything is ready”)

In most contexts, you’ll hear semuanya when you mean “everything” as a whole.

sudah is the perfective aspect marker meaning already or has been. It indicates that the action or change of state is complete.

• siap = ready (state)
• sudah siap = already ready / has become ready

Without sudah, you’d just state a condition; with sudah, you emphasize that the preparation process is finished.

Indonesian routinely omits the copula (“to be”) in simple predicative sentences. The linking verb adalah (is/are) exists but is generally left out in everyday speech. So

• Semuanya sudah siap

literally reads “Everything already ready,” with the “is” understood. Using adalah here would sound overly formal or stilted.

Swap sudah (already) for its opposite belum (not yet):

• Semuanya belum siap.

This means “Everything is not ready yet.”

Yes, but the nuance shifts:

• Semuanya sudah siap. → States a condition: “Everything is ready.”
• Semuanya sudah disiapkan. → Focuses on the action: “Everything has been prepared (by someone).”

Both are correct; choose the one that fits whether you’re describing a state (siap) or highlighting the preparation process (disiapkan).