Ini buku saya. (This is my book). Ini buku anda. (This is your book). Ini buku dia. or Ini bukunya. (This is his book). It is important to remember the word order. The noun is preceded by the modifier.
BUKAN is used to negate a noun. Itu bukan meja.(That is not a table). TIDAK is used to negate a verb, adjective. Hidupnya tidak bahagia. (His life is not happy).