Malay

Mostly intelligible, but not identical. Malaysian Malay and Indonesian both descend from a Riau Malay base and share the bulk of their grammar and core vocabulary, but they've diverged in spelling reforms, technical vocabulary, and colloquial registers. Indonesian absorbed Dutch loanwords; Malay absorbed English ones. Speakers of one can usually follow the other with minor adjustment.

Malaysia, Brunei, and Singapore (alongside English, Mandarin, and Tamil) recognize Malay as official. Indonesia recognizes Indonesian as its sole national language. Southern Thailand and parts of the southern Philippines have substantial Malay-speaking populations as well. Across maritime Southeast Asia it functions as a regional lingua franca with deep historical reach.

Malay builds new vocabulary by attaching prefixes (meN-, ber-, di-, ter-, peN-) and suffixes (-an, -kan, -i) to roots. From the root ajar (teach) you get mengajar (to teach), pelajar (student), pelajaran (lesson), pengajar (teacher), pembelajaran (learning process). Once you learn the affix patterns, vocabulary expands without rote memorization.

There is no verb conjugation for tense. Time is shown by context, time-of-day adverbs, and aspect particles like sudah (already), belum (not yet), sedang (currently), and akan (will). The same verb form appears whether you're talking about yesterday, today, or tomorrow — the surrounding words carry the temporal information.

Among major languages, Malay is one of the more accessible for English speakers. The Latin alphabet, the lack of inflection, and SVO word order all reduce the learning curve. The genuinely tricky pieces are the affix system, which can stack into long derived words, and the wide gap between formal Malay and the colloquial registers spoken across different regions.