「你在幹嘛？」可以怎麼問：
What are you doing?
What’s up? （這個固定會回：Not much！沒幹嘛；還好）
What are you up to?
「我在忙」：
I'm in the middle of something.
「白忙一場」：
a waste of time
in vain
a wild goose chase
All of my effort for this project turned out to be a waste of time.
All of my effort for this project was in vain.
All of my effort for this project was like a wild goose chase.
我（做這份報告）的努力都白費了！
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