I call this process katakanization because foreign words adapted into Japanese are typically spelled with katakana characters and are commonly called katakana-go (katakana words). One of the most common reasons I hear some learners (even when their Japanese is pretty advanced) avoid katakanizing English words is, "Why can't I just pronounce English words correctly?" Japanese Speakers Use English Loanwords, Like A LotJapanese people use 3,000 - 5,000 loanwords in daily conversations, and 94% of them are of English origin. Unpronounceable English SoundsYou may also want to ask why Japanese speakers katakanize English words in the first place. When you start being able to convert English words to katakana smoothly, and recognize more katakana words that Japanese speakers use, you would be surprised how many words you know already!