- Why didn't you like it?
你為什麼不喜歡呢? - How did you know that?
你怎麼知道呢? - Why do you want to know that?
你為什麼要知道呢? - How do we celebrate it?
我們要如何慶祝呢? - How do you make them?
(對某件工藝品等...)你要如何做出它們呢? - How was your trip to Japen?
- Why don't we look for them right now?
- I don't know why you are here.
I don't know what you are doing here.
我不知道你在這裡做什麼