I went to Australia on vacation .对 on vacation提问怎么说?急用

I went to Australia on vacation .对 on vacation提问怎么说?急用
I went to Australia on vacation .对 on vacation提问怎么说?急用

I went to Australia on vacation .对 on vacation提问怎么说?急用
When did you go tu Australia?提问时间
on vacation是在假期中；for vacation就为了度假.
如果是for就是用Why提问

Why did you go to Aurtralia?

When did you go Australia?你何时去了澳大利亚？

老师讲的是why
on vacation也用why