And are they natural? In what situation will you use it?
- Why not google it?
- Why don't you google it?
- I think you can google it.
- You'd better google it.
- I'd google it if I were you.
And are they natural? In what situation will you use it?
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Since you're telling the person that they should really do now what they should have done already, the advice is always going to sound a little patronizing or critical, unless you suggest that a Google search might not yield helpful results (perhaps because the search terms are very broad, say, or the topic is very recondite):
You could try to Google it.
Emphasis on try not on could. If you put the emphasis on could, the tone is sarcastic.