How do I say "I want to be" in japanese?
I know that for "i want to.." when using verbs you just have to replace the last syllable to -tai, turning it into an -i adjective (ex: 食べたい, tabetai)
But since "desu" is mostly a politeness sufix, not a real verb, this rule wouldn't apply to it. How can I say it then?

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~になりたい
It means, "I want to become ~"

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hmm...I'sorry. I can't understand English only a littel.

ex:
I want to eat cake(私は　ケーキが　食べたい　です。/watasiha ke-kiga tabetai desu)
I want to watch TV(私は　テレビが　見たい　です。/watasiha terebiga mitai desu)

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すいません回答に自信がなくなってきました・・・

どなたか分かる方教えてあげてください；＾＾