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たい

Saying what you want to do: 〜たい

Stem + たい, and why you don't use it about other people.
要点The idea
Verb stem + たい means “want to do”, and the result is an い-adjective, so it conjugates like one.
Form
want to eat食(た)たべたいtabetai
don't want to eat食(た)たべたくないtabetakunai
wanted to eat食(た)たべたかったtabetakatta
polite食(た)たべたい ですtabetai desu
日本(にほん)にほん に 行(い)いきたい。nihon ni ikitai.I want to go to Japan.
何(なに)なに が 飲(の)のみたい?nani ga nomitai?What do you want to drink?The object can take が or を with たい.
今日(きょう)きょう は 何(なに)なに も したくない。kyou wa nani mo shitakunai.I don't want to do anything today.
弟(おとうと)おとうと は ゲーム を 買(か)かいたがって いる。otouto wa geemu o kaitagatte iru.My little brother wants to buy a game.For other people: stem + たがっている.
A水(みず)みず を 飲(の)のみたい。mizu o nomitai.I want to drink some water.
B水(みず)みず が 飲(の)のみたい。mizu ga nomitai.I want some water.
Both are fine with たい: を is neutral, and が puts a little more weight on the thing you want.

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