[KyleGoetz]

Originally Posted by maninhat

the first one i will agree is rediculous, but the last two i see and use quite often actually.

By whom?

I was explicitly corrected when I was a student and used them. My (Japanese-citizen) professor may have even deducted points off my essays. It may even have happened when I attended university in Japan as well, but I may have learned by then not to use those kanji in that way.

I was taught that it is poor style to use kanji for 〜て下さる (but not for を下さる) and poor style to use 出来る rather than できる. Sort of like writing "labour" or "specialise" in the US. It's technically correct, but poor style to do so. Or maybe more like writing "can't" instead of "cannot," e.g. It's technically correct, but considered poor style in certain contexts.

Some quick googling revealed this:

「できる」
・出来合い、出来上がり、出来心、出来高、出来具合な ど、「でき…」という場合は漢字を使う。
・…することができる、できる限り、できるだけ、勉強 がよくできる、橋ができる、理解できるなど、動詞、副 詞などは原則として平仮名書き

which confirms what I said (granted this isn't an authoritative source).

Additionally, I know for a fact there is a "Japanese style guide" that says you should only use the kanji version of 下さる when speaking of receiving an object, not when someone does something for you. That is to say,

○コーヒを下さい
×宿題を出して下さい
○宿題を出してください

On a Mac, typing ください in the first and third examples automatically went to kanji after hitting spacebar. However, in the second example, I had to hit it twice (the first time it remained kana). So Mac software seems to recognize the style rule, too.

Finally, this website confirms what I said about ください: 「下さい」と「ください」の使い分け（広報Q&A）：日本 広報協会

「クダ」の部分を漢字にするか仮名書きにするかは、意 味や用法によって使い分ける必要があります。
漢字を使う場合
「飲み物をクダさい」といった実質動詞（「くれ」の尊 敬・丁寧表現）の場合は、「下さい」と漢字書きにしま す。
仮名書きにする場合
「お飲みクダさい」といった補助動詞（何かをお願いす るときや、敬意を表す尊敬・丁寧表現）の場合は、「く ださい」と仮名書きにします。