Can Hiragana or Katakana stand alone?


Writing Japanese requires a mix of Kanji and Hiragana, usually some Katakana
as well. I have read that some Kanji characters can be replaced with Hiragana
characters for easier writing.  

My question is: can all Kanji characters be replaced? Can I write Japanese
only with Hiragana or only in Katakana and be fully understood?




Kanji can always be replaced with hiragana, for example

  * if the writer cannot recall the correct kanji, or
  * the intended reader is likely to have a limited knowledge of kanji (eg children), or
  * the kanji for the word is not in general use, or
  * pretty much any reason you want.

The use of katakana, however, is usually reserved for borrow words, emphasis
and so on.

So writing using only hiragana is both valid and understandable, with the
caveat that in many cases doing so will make your writing very awkward
reading, and can introduce ambiguity into your writing, for example in the
case of homophones (words that share the same pronunciation but generally
different kanji).

Compare the following two ways of writing the same well-known sentence:

> 庭には二羽鶏がいる  
>  にわにはにわにわとりがいる

I think all Japanese speakers would agree that the kanji version is much
easier reading and much clearer than the hiragana-only version.

Writing using only katakana will be more awkward to read because it is not
generally expected for Japanese words to be written in katakana, and for the
same reason would probably be considered invalid, except in certain
circumstances like to put emphases on pronunciation. If you did decide to
write this way for some reason, however, it would be just as understandable as
writing in only hiragana as the two characters sets have a one-to-one
relationship.




Kanji can always be replaced with hiragana, for example

  * if the writer cannot recall the correct kanji, or
  * the intended reader is likely to have a limited knowledge of kanji (eg children), or
  * the kanji for the word is not in general use, or
  * pretty much any reason you want.

The use of katakana, however, is usually reserved for borrow words, emphasis
and so on.

So writing using only hiragana is both valid and understandable, with the
caveat that in many cases doing so will make your writing very awkward
reading, and can introduce ambiguity into your writing, for example in the
case of homophones (words that share the same pronunciation but generally
different kanji).

Compare the following two ways of writing the same well-known sentence:

> 庭には二羽鶏がいる  
>  にわにはにわにわとりがいる

I think all Japanese speakers would agree that the kanji version is much
easier reading and much clearer than the hiragana-only version.

Writing using only katakana will be more awkward to read because it is not
generally expected for Japanese words to be written in katakana, and for the
same reason would probably be considered invalid, except in certain
circumstances like to put emphases on pronunciation. If you did decide to
write this way for some reason, however, it would be just as understandable as
writing in only hiragana as the two characters sets have a one-to-one
relationship.

