日本語 Japanese Ask Questions Thread 3

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Japanese Ask Questions Thread2
http://dis.4chan.org/read/lang/1206158123/1-40

>>234 is right.
どうしたの？ sounds softer than どうした？.
But note that you cannot replace ka with no in the expression in >>233.

どうしたの？　ok
どうした？　　ok
どうしたか？　wrong

できたの？　ok
できた？　　ok
できたか？　ok

Learners of Japanese may explain better why できたか is correct and どうしたか is wrong.