Verb +tai desu (to want/wish) polite form
This structure is made with the indefinite base of the verb+ tai desu.
Godan verbs
Hanashi (indefinite base of ‘hanasu’) + tai desu = Hanashi tai desu -I would like to speak
Kare wa kanojo to hanashitaidesu – He would like to speak to her
Yomi (indefinite base of ‘yomu’) + tai desu = Yomi tai desu – I would like to read
Watashi wa ano hon o yomi taidesu – I would like to read that book
ichidan verbs
Tabe (indefnite base of ‘taberu’) + tai desu = Tabe tai desu – I would like to eat
Kanojo wa sushi o tabetaidesu – She would like to eat sushi
Mi +tai desu=Mi tai desu.
Karera wa terebi o mitaidesu – They would like to watch tv
Irregular verbs
Shi (indefinite base of ‘suru’) + tai desu = Shi tai desu
Watashi wa nihongo o benkyō shitaidesu – I would like to study Japanese – do the study
Ki (indefinite base of ‘kuru’) + tai desu = ki tai desu
Watashi wa kōen ni kitaidesu – I would like to come to the park
For the colloquial form you only delete desu from the polite form:
Watashi wa shōsetsu o kakitaidesu – I would like to write a novel (polite form)
Watashi wa shōsetsu o kakitai – I would like to write a novel (colloquial form)
The polite negative form has taku+arimasen instead of tai desu.
The colloquial negative form is: taku + nai
Examples:
Watashi wa shōsetsu o kaki taku arimasen – I don’t want to write a novel (polite form)
Watashi wa shōsetsu o kaki taku nai – I don’t want to write a novel (colloquial form)