Well, the best way to know if a girl is interested in you is simply to ask. Despite what is said about being romantic and spontaneous, the best way to know for sure is to simply ask, "Would you to do something sometime, like go for coffee or go see a movie?" and take it from there.
Always remember that the worst that can happen when you ask out a girl is that she'll say no. There are too many girls in each country in this world to be concerned when one of them rejects you.
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