たいWant to do

The たい form expresses personal desires, such as 日本に行きたい ('I want to go to Japan'). がる, on the other hand, is a suffix that shows when someone else appears to want something, like 日本に行きたがっている ('They seem like they want to go to Japan'). The たい form is typically not used for expressing others' desires unless quoting the subject.

Both たい and てほしい express a desire, with one key difference. The たい form is used to express your own desires, similar to the English 'I want to...' while てほしい expresses your desires for other people, or in other words, 'I want you to…' For example, 見たい would express your desire to see something, while 見てほしい would be used if you want someone else to take a look.

The たい form expresses personal desires, like バナナが食べたい ('I want to eat a banana'). がる, on the other hand, is used to show that someone else seems to want something, like 食べたがっている ('[He/she] seems like they want to eat'). The たい form is generally not used for others' desires unless the subject has explicitly made their desire clear.

The たい form expresses personal desires, such as 日本に行きたい ('I want to go to Japan'), though, the たい form is typically not used for expressing others' desires. One way that we can comment on another person's desires, however, is to use the そう form, meaning 'appears to.' For example 日本に行きたそう can be used to mean 'They seem to want to go to Japan.'

ませんか is a polite way to extend an invitation, similar to 'Wouldn't you like to...?' in English. For example, 何か食べませんか？ ('Won't you eat something?') might be used when politely offering food to a guest. Note that unlike English, the たい form ('Do you want to…?') isn't typically used to invite someone in Japanese—何か食べたいですか？ simply asks if the person wants to eat something.

Both the たい form and がほしい express desires, similar to the English 'want.' The difference is that たい is used with verbs to express one's desire to perform some action, while がほしい is used after nouns to express one's desire for an object. For example, 日本に行きたい means 'I want to go to Japan' (desire to do something), while お金がほしい means 'I want money' (desire for an object).