Kore (This) – Referring to something very close to the person talking
Kore+ra=Korera (These)
Sore(That) – Referring to something not close but not far from the person talking
Sore+ra=Sorera (Those)
Are (That) – Referring to something far from the person talking
Are+ra=Arera (Those)
Examples:
Kore wa isu desu – This is a chair
Are wa yama desu – That is a mountain
*desu confirms what is said in the sentence.
The demonstrative pronouns can become demonstrative adjectives by keeping the first two letters and adding no at the end for the singular and just adding no for the plural:
Kono jisho- This dictionary
Sono pen – That pen
Ano kōen – That park
Korerano hon – These books
Sorerano monogatari – Those fairytales