To turn certain words into plural forms, we can add たち to the end of a noun or pronoun. It can be written using hiragana, but is also sometimes written using kanji (達).
たち is often used with personal pronouns such as 私 + たち = 私たち (we, us), or あなた + たち = あなたたち (you, you guys).
It can be used to mark a group of people, e.g. 学生たち (students), 子供たち (children). Of course, 学生 and 子供 can be used on their own to mean students and children, so the key difference here is that たち implies there is a group in particular you are referring to.
|Children like anime.||こども は アニメ が 好き です。kodomo wa anime ga suki desu.|
|The children at this school are really kind.||この 学校 の こどもたち は とても 優しい です。kono gakkou no kodomotachi wa totemo yasashii desu.|
|they; them (female only)||彼女たちkanojotachi|
The suffix ら (等) can also be used with some nouns to pluralize them, but as it can come across as very informal or direct it is safer to use たち when in doubt.
However, ら is used with 彼 to make 彼ら (they, them), which is more commonly used than 彼たち.
ら is also commonly used with これ and それ.
|(I) think they go to the same university.||かれら は 同じ 大学 に 行く と 思う。karera wa onaji daigaku ni iku to omou.|
|"Whose books are these?" "They're mine."||「これら の 本 は 誰 の です か。」 「私 の です。」 「korera no hon wa dare no desu ka.」 「watashi no desu.」|
|What are those?||それら は 何 か。sorera wa nani ka.|