たい details
write + want to do
kaki tai
want to do
meaning: want to write
今夜は寿司が食べたいな。
kon'ya wa sushi ga tabetai na.
I feel like sushi tonight. casual
将来は海外で働きたい。
shourai wa kaigai de hataraki tai.
In the future I want to work abroad. neutral
- negative
- past
- negative past
- polite
Examples
want to do — the speaker's own desire to perform an action
今夜は寿司が食べたいな。
kon'ya wa sushi ga tabetai na.
I feel like sushi tonight. casual
将来は海外で働きたいです。
shourai wa kaigai de hatarakitaidesu.
In the future I want to work abroad. neutral
本日は新しい計画についてお話ししたいと思います。
honjitsu wa atarashii keikaku ni tsuite o hanashi shitai to omoimasu.
Today I would like to talk about the new plan. formal
Formation
{V-masu-stem}たいattaches to ます-stem
Notes
Related patterns
Similar
Both conjugate as i-adjectives and mark the desired target with が — たい wants an ACTION and rides a verb stem, ほしい wants a THING and follows a bare noun.
Lookalikes
One kana apart in the past (行きたかった/行きたがった), but たい asserts the speaker's own urge while plain third-person desire requires たがる — which also prefers を where たい leans on が.
Both hang "want" on a verb, but たい (masu-stem) wants to act yourself while てほしい (て-form) wants someone ELSE to act — 手伝いたい offers help, 手伝ってほしい requests it.