I have a sentence

When tourists visit Australia?

Now, my question is - do I need to put "do" in it?

When do tourists visit Australia?

I don't know why, but the first one seems more natural to me. Thanks!

  • 2
    Yes, because interrogatives require subject-auxiliary inversion. If there is no auxiliary verb present in the basic order version, the dummy auxiliary verb "do" must be inserted before the subject. – BillJ Mar 3 '17 at 15:32
  • 1
    As @BillJ says. As such, the first example by itself is not a question. For example, you could say "When tourists visit Australia, tour operators are happy and profitable." – user3169 Mar 3 '17 at 21:31
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    It isn't particularly useful to answer a question with "Why? That's just the way English is", particularly in the comments section where it can't be downvoted. There is a reason here, as BillJ explains. If you don't know that reason, you can let someone else explain. – snailplane Mar 4 '17 at 0:25

Your two sentences have two completely different meanings.

It depends what you are asking

When tourists visit Australia?

might be used to ask if something happens while tourists are visiing Australia

When do tourists visit Australia?

ask about the time and dates when tourists visit Australia.

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