meN-

The meN- prefix is a 'nasal' prefix, meaning its spelling changes based on the first letter of the root word. The 'N' is a morphophoneme that undergoes a process called nasal assimilation.

1. The Function
Its main job is to mark the active voice. It is most commonly used with transitive verbs (verbs that take an object), but it also appears on some intransitive verbs like menangis (to cry) or menyanyi (to sing). It is also frequently paired with the suffixes -kan or -i to form complex transitive verbs. When these suffixes are added, the prefix spelling rules apply to the root word in exactly the same way.

2. The Spelling Rules (Allomorphs)
The nasal sound in meN- adapts to the root's initial letter:

• me-: Used with roots starting with l, m, n, r, w, y, ng, ny (e.g., lihat → melihat).
• mem-: Used with roots starting with b, f, v, and replaces p (e.g., baca → membaca, fokus → memfokuskan, pakai → memakai).
• men-: Used with roots starting with c, d, j, z, sy, and replaces t (e.g., dengar → mendengar, syarat → mensyaratkan, tolong → menolong).
• meng-: Used with vowels (a, e, i, o, u) and g, gh, h, kh, q, x, and replaces k (e.g., ambil → mengambil, qada → mengqada, X-ray → meng-X-ray, kirim → mengirim).
• meny-: Replaces the initial s in root words (e.g., sapu → menyapu).
• menge-: Used for one-syllable roots (e.g., cat → mengecat).

Hyphenation Rule: A hyphen is required when attaching a prefix to an acronym, proper noun, or a base word that already contains a hyphen (e.g., e-mel → meng-e-melkan, X-ray → meng-X-ray).

3. The K-P-S-T Rule
If a root starts with k, p, s, or t, that first letter is usually dropped and replaced by a nasal sound:

• k becomes meng- (kirim → mengirim)
• p becomes mem- (pakai → memakai)
• s becomes meny- (sewa → menyewa)
• t becomes men- (tolong → menolong)

Note: There are a few exceptions where the initial letter is retained. Consonants are retained if they are part of a consonant cluster (e.g., protes → memprotes). Many foreign loanwords also retain their initial letter to preserve etymology (e.g., tafsir → mentafsirkan, kategori → mengkategorikan, pamer → mempamerkan, sabotaj → mensabotaj). When meN- is attached to a word that already has a prefix starting with 'p' (like per- or pel-), the 'p' is retained (e.g., perbaiki → memperbaiki, pelajari → mempelajari). A few native Malay words arbitrarily retain the 't', such as ternak (menternak) and tertawa (mentertawakan). The roots punya, peduli, and pelopor retain their 'p' to become mempunyai, mempedulikan, and mempelopori. Finally, the root kaji becomes mengkaji (to study or research) to distinguish it from mengaji (to recite the Quran).

4. Register Differences
In formal writing, meN- is standard for most transitive verbs. However, common verbs like makan (eat) and minum (drink) are perfectly grammatical and formal as active transitive verbs without the prefix. The prefixed form memakan is mostly reserved for figurative expressions (e.g., memakan masa = to consume time). In casual conversation, speakers often drop the prefix for other verbs as well (e.g., Saya beli buku instead of Saya membeli buku).