TAKOBOTO

I want to (verb)
netai: I want to sleep

にほんにいきたいです。

(I) want to go to Japan.

きみのところへいきたいよ。

(I) want to go to where you are.

にほんでえいごをおしえたいです。

I want to teach English in Japan.

どこにいきたいですか

where do you want to go?

にほんごをまなびたいです

I want to learn Japanese

It is considered impolite to ask someone else if the "want" to do something. Instead, use the negative form of the verb in a question.

eriustobin

Very important: "tai" can only be used for the I person, like "i want".
If you want to say that someone else wants, you use "tagaru".
Ex:かれは牛乳を飲みたがっています。
This is because Japanese never imply they know what someone else wishes, and "garu" means: "i think that", "i heard that", etc.

kuro_hannah